Quarterly report pursuant to Section 13 or 15(d)

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

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Non-controlling Interests (Summary of the impact of the consolidated VIE) (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 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 11,566 22,348
Construction in Progress [Member]
    
Variable Interest Entity [Line Items]    
Variable Interest Entity, Classification of Carrying Amount, Assets 21,389 10,607
Noncontrolling Interests [Member]
    
Variable Interest Entity [Line Items]    
Variable Interest Entity, Classification of Carrying Amount, Liabilities and Equity 32,024 32,258
Retained Earnings [Member]
    
Variable Interest Entity [Line Items]    
Variable Interest Entity, Classification of Carrying Amount, Liabilities and Equity $ 931 $ 697