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
Sep. 30, 2012
Dec. 31, 2011
Variable Interest Entity [Line Items]    
Variable Interest Entity, Classification of Carrying Amount, Assets $ 16,546 $ 16,621
Variable Interest Entity, Classification of Carrying Amount, Liabilities and Equity 16,546 16,621
Restricted Cash [Member]
    
Variable Interest Entity [Line Items]    
Variable Interest Entity, Classification of Carrying Amount, Assets 10,445 15,910
Construction in Progress [Member]
    
Variable Interest Entity [Line Items]    
Variable Interest Entity, Classification of Carrying Amount, Assets 6,101 711
Noncontrolling Interest [Member]
    
Variable Interest Entity [Line Items]    
Variable Interest Entity, Classification of Carrying Amount, Liabilities and Equity 15,777 16,308
Retained Earnings [Member]
    
Variable Interest Entity [Line Items]    
Variable Interest Entity, Classification of Carrying Amount, Liabilities and Equity $ 769 $ 313