Quarterly report pursuant to Section 13 or 15(d)

Non-controlling Interests (Summary of the impact of the consolidated VIE) (Details)

v2.4.0.6
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