| **Non-controlling Interests (Summary of the impact of the consolidated VIE) (Details) (USD $)In Thousands, unless otherwise specified** | Mar. 31, 2013 | Dec. 31, 2012 |
|-----------------------------------------------------------------------------------------------------------------------------------------|---------------|---------------|
| **Variable Interest Entity [Line Items]**                                                                                               |          |          |
| Variable Interest Entity, Classification of Carrying Amount, Assets                                                                     | $ 32,955      | $ 32,955      |
| Variable Interest Entity, Classification of Carrying Amount, Liabilities and Equity                                                     | 32,955        | 32,955        |
| Restricted Cash [Member]                                                                                                                |          |          |
| **Variable Interest Entity [Line Items]**                                                                                               |          |          |
| Variable Interest Entity, Classification of Carrying Amount, Assets                                                                     | 18,181        | 22,348        |
| Construction in Progress [Member]                                                                                                       |          |          |
| **Variable Interest Entity [Line Items]**                                                                                               |          |          |
| Variable Interest Entity, Classification of Carrying Amount, Assets                                                                     | 14,774        | 10,607        |
| Noncontrolling Interests [Member]                                                                                                       |          |          |
| **Variable Interest Entity [Line Items]**                                                                                               |          |          |
| Variable Interest Entity, Classification of Carrying Amount, Liabilities and Equity                                                     | 32,141        | 32,258        |
| Retained Earnings [Member]                                                                                                              |          |          |
| **Variable Interest Entity [Line Items]**                                                                                               |          |          |
| Variable Interest Entity, Classification of Carrying Amount, Liabilities and Equity                                                     | $ 814         | $ 697         |

| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The carrying amount of the consolidated Variable Interest Entity's assets included in the reporting entity's statement of financial position.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (bb) -URI http://asc.fasb.org/extlink&oid=7880789&loc=d3e5710-111685
+ Details**Name:**us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                    |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The net carrying amount of the consolidated Variable Interest Entity's assets and liabilities included in the reporting entity's statement of financial position.
+ References
No definition available.
+ Details**Name:**us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssetsAndLiabilitiesNet**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**instant |
| X                                                                                                                                                                   |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_VariableInterestEntityLineItems**Namespace Prefix:**us-gaap_**Data Type:**xbrli:stringItemType**Balance Type:**na**Period Type:**duration |