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Noncontrolling Interests (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Noncontrolling Interests                      
Net income attributable to noncontrolling interests                 $ 1,511    
Accounts receivable 268,095       187,378       268,095 187,378  
Current liabilities 420,669       345,019       420,669 345,019  
Carrying value of assets 931,207       728,413       931,207 728,413  
Carrying value of liabilities 598,569       453,481       598,569 453,481  
Revenues 480,883 431,842 337,436 291,573 373,066 375,483 351,956 359,645 1,541,734 1,460,150 941,765
Blythe joint venture
                      
Noncontrolling Interests                      
Net income attributable to noncontrolling interests                 1,511    
Cash 3,565               3,565    
Accounts receivable 8,843               8,843    
Current liabilities 9,379               9,379    
Carrying value of assets         2,546         2,546  
Carrying value of liabilities         2,540         2,540  
Blythe joint venture | Primary beneficiary
                      
Noncontrolling Interests                      
Revenues                 $ 25,769