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Related Party Transactions (Details) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Chairman and Chief Executive Officer [Member]
     
Related Party Transactions [Abstract]      
Monthly payments under non-cancelable operating lease agreements $ 200,000    
Percentage increase per annum in monthly lease payments under non-cancelable operating lease agreements (in hundredths) 3.00%    
Lease expense under non-cancelable operating lease agreements 2,300,000 2,300,000 2,300,000
O&G Industries, Inc. [Member]
     
Related Party Transactions [Abstract]      
Company's share of revenues of joint ventures where the joint venture partner is a related party 19,300,000 5,500,000 0
Maximum percentage of revenues earned from joint ventures where the joint venture partner is a related party (in hundredths) 1.00% 1.00%  
Number of Company's shares of common stock held by related party joint venture partner (in shares) 600,000 600,000  
Percentage of common stock held by related party (in hundredths) 1.26% 1.27%  
JF Aviation, LLC [Member]
     
Related Party Transactions [Abstract]      
Expenses incurred with related party $ 400,000 $ 300,000