| **Fair Value Measurements - Textuals (Details) - USD ($)**                                       | 3 Months Ended |        |
|--------------------------------------------------------------------------------------------------|----------------|--------|
||
| Fair Value, Measurements, Nonrecurring [Member]                                                  |           |   |   |
| **Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]** |           |   |   |
| Gains or losses related to non-financial assets and liabilities                                  | $ 0            | $ 0    |   |
| Senior Notes [Member] | 5.125% Senior Notes Due 2023 [Member]                                    |           |   |   |
| **Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]** |           |   |   |
| Debt instrument interest rate (percent)                                                          | 5.125%         |   | 5.125% |
| Senior Notes [Member] | 5.75% Senior Notes Due 2024 [Member]                                     |           |   |   |
| **Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]** |           |   |   |
| Debt instrument interest rate (percent)                                                          | 5.75%          |   | 5.75% |
| Senior Notes [Member] | 5.75% Senior Notes Due 2025 [Member]                                     |           |   |   |
| **Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]** |           |   |   |
| Debt instrument interest rate (percent)                                                          | 5.75%          |   | 5.75% |

| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Contractual interest rate for funds borrowed, under the debt agreement.
+ References
Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
For each line item in the statement of financial position, the amounts of gains and losses from fair value changes included in earnings.
+ References
Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=75031198&loc=d3e14172-108612
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| X                                                                                                                                                                                   |
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| X                                                                                                                                              |
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| X                                                                                                                                                     |
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| X                                                                                                                                                   |
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| X                                                                                                                                                    |
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