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ExpressJet Merger (Details) (USD $)
12 Months Ended 1 Months Ended 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Nov. 30, 2010
ExpressJet
Dec. 31, 2011
ExpressJet
Dec. 31, 2010
ExpressJet
Nov. 12, 2010
ExpressJet
ExpressJet Merger              
Per share cash payable pursuant to the right (in dollars per share)             $ 6.75
Aggregate value of the ExpressJet Merger consideration             $ 131,600,000
Aggregate value of Merger consideration             136,469,000
Percentage of revenue of acquired entity as a percentage of the reporting entity's total revenues           4.00%  
Details of aggregate consideration and estimated fair values of the tangible assets acquired and liabilities assumed              
Current assets, net             133,397,000
Property, plant and equipment             128,744,000
Other non-current assets             35,061,000
Current liabilities             (141,974,000)
Long-term liabilities             (3,173,000)
Purchase accounting gain 5,711,000 (15,586,000)   (15,586,000)      
Total consideration             136,469,000
Less cash acquired             (82,452,000)
Net cash paid   54,018,000   54,017,000      
Increase to the deferred tax liabilities resulting from adjustment to the business acquisition         5,700,000    
Unaudited pro forma combined results of operations after giving effect to the ExpressJet Merger              
Revenue   3,476,415,000 3,301,872,000        
Net Income   $ 59,264,000 $ 87,125,000        
Basic earnings per share (in dollars per share)   $ 1.07 $ 1.56        
Diluted earnings per share (in dollars per share)   $ 1.05 $ 1.53