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Noncontrolling Interests (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Noncontrolling Interests          
Revenues $ 515,291 $ 445,013 $ 985,365 $ 855,008  
Net income attributable to noncontrolling interests   329 432 599  
Tax effect on income recognized 10,618 9,990 17,708 16,197  
Accounts receivable 311,321   311,321   304,955
Current liabilities 422,054   422,054   430,314
Blythe joint venture | Primary beneficiary
          
Noncontrolling Interests          
Revenues   15,631 940 31,903  
Net income attributable to noncontrolling interests   329 432 599  
Tax effect on income recognized     0    
Distributions to non-controlling interests     1,515 0  
Distributions from joint venture     1,515 0  
Capital contributions     0    
Cash 250   250   3,025
Accounts receivable         1,085
Current liabilities $ 348   $ 348   $ 2,041