Quarterly report pursuant to Section 13 or 15(d)

Variable Interest Entities (Summary of the impact of the consolidated VIE) (Details)

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Variable Interest Entities (Summary of the impact of the consolidated VIE) (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 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] | Primary Beneficiary [Member]
    
Variable Interest Entity [Line Items]    
Variable Interest Entity, Classification of Carrying Amount, Assets 3,327 22,348
Noncontrolling Interests [Member] | Primary Beneficiary [Member]
    
Variable Interest Entity [Line Items]    
Variable Interest Entity, Classification of Carrying Amount, Liabilities and Equity 31,906 32,258
Construction in Progress [Member] | Primary Beneficiary [Member]
    
Variable Interest Entity [Line Items]    
Variable Interest Entity, Classification of Carrying Amount, Assets 29,628 10,607
Retained Earnings [Member] | Primary Beneficiary [Member]
    
Variable Interest Entity [Line Items]    
Variable Interest Entity, Classification of Carrying Amount, Liabilities and Equity 1,049 697
Unicom [Member] | Restricted Cash [Member] | Primary Beneficiary [Member]
    
Variable Interest Entity [Line Items]    
Variable Interest Entity, Classification of Carrying Amount, Assets $ 8,600 $ 8,600