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Acquisitions (Narrative) (Details) (Maverick [Member], USD $)
3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Jul. 08, 2011
Maverick [Member]
     
Business Acquisition [Line Items]      
Revenue included in the consolidated statement of operations $ 34,900,000    
Aggregate purchase price     186,300,000
Additional depreciation   3,100,000  
Amortization expense, for the amortization of intangible assets   607,000  
Interest expense   $ 3,600,000