| **Share-based Compensation (Details 2) (Stock Settled Stock Appreciation Rights (SSARS) [Member], USD $)In Thousands, except Share data, unless otherwise specified** | 3 Months Ended           |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------|--------------------------|
||
| Stock Settled Stock Appreciation Rights (SSARS) [Member]                                                                                                              |                     |
| **Share-based Compensation Arrangement by Share-based Payment Award [Line Items]**                                                                                    |                     |
| Number of Rights Outstanding at April 1, 2012                                                                                                                         | 683,119,000              |
| Weighted Average Exercise Price Outstanding at April 1, 2012                                                                                                          | $ 6.27                   |
| Number of Rights Granted,                                                                                                                                             | 116,405,000              |
| Weighted Average Exercise Price Granted,                                                                                                                              | $ 12.38                  |
| Number of Rights Exercised                                                                                                                                            | (216,061,000)            |
| Weighted Average Exercise Price Exercised                                                                                                                             | $ 6.69                   |
| Number of Rights, Forfeited                                                                                                                                           | 0                        |
| Weighted Average Exercise Price, Forfeited                                                                                                                            | $ 0.00                   |
| Number of Rights Outstanding at December 31, 2012                                                                                                                     | 583,463,000              |
| Weighted Average Exercise Price Outstanding at December 31, 2012                                                                                                      | $ 8.50                   |
| Remaining Contractual Term Outstanding at December 31, 2012                                                                                                           | 6 years 3 months 29 days |
| Aggregate Intrinsic Value Outstanding at December 31, 2012                                                                                                            | $ 1,754                  |
| Number of Rights Exercisable at December 31, 2012                                                                                                                     | 214,697,000              |
| Weighted Average Exercise Price Exercisable at December 31, 2012                                                                                                      | $ 7.70                   |
| Remaining Contractual Term Exercisable at December 31, 2012                                                                                                           | 5 years 2 months 23 days |
| Aggregate Intrinsic Value Exercisable at December 31, 2012                                                                                                            | $ 784                    |

| X                                                                                                                                                                                                                                                                                                                                                                                           |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Share based compensation arrangement by share based payment award non option equity instruments exercisable.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Share Based Compensation Arrangement By Share Based Payment Award Non Option Equity Instruments Exercisable Aggregate Intrinsic Value.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Share Based Compensation Arrangement By Share Based Payment Award Non Option Equity Instruments Exercisable Weighted Average Exercise Price.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Share Based Compensation Arrangement By Share Based Payment Award Non Option Equity Instruments Exercisable Weighted Average Remaining Contractual Terms.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Share Based Compensation Arrangement By Share Based Payment Award Non Option Equity Instruments Forfeitures In Period Weighted Average Exercise Price
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                         |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Share Based Payment Award Non Option Equity Instruments Outstanding Aggregate Intrinsic Value.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Share Based Compensation Arrangement By Share Based Payment Award Non Option Equity Instruments Outstanding Weighted Average Exercise Price.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Share Based Compensation Arrangement By Share Based Payment Award Non Option Equity Instruments Outstanding Weighted Average Remaining Contractual Terms.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Share Based Compensation Arrangements By Share Based Payment Award Non Option Equity Instruments Exercises In Period Weighted Average Exercise Price
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Share Based Compensation Arrangements By Share Based Payment Award Non Option Equity Instruments Grants In Period Weighted Average Exercise Price
+ References
No definition available.
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| X                                                                                                                                                                                                      |
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Number of non-option equity instruments exercised by participants.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Number of shares under non-option equity instrument agreements that were cancelled as a result of occurrence of a terminating event.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Net number of non-option equity instruments granted to participants.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Number of shares reserved for issuance under non-option equity instrument agreements awarded that validly exist and are outstanding, including vested instruments.
+ References
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