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Segment Information (Reconciliation of Revenue from Segments to Consolidated) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Segment Reporting [Abstract]    
Segment Margin $ 90,205 $ 52,612
Depreciation and amortization (38,373) (32,256)
General and administrative (21,143) (14,521)
Bad debt (expense) recovery 91 84
Impairment of equipment (1,032) 0
Income from operations $ 29,748 $ 5,919