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Segment Information (Reconciliation of Revenue from Segments to Consolidated) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Sep. 30, 2010
Jun. 30, 2010
Mar. 31, 2010
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Segment Reporting [Abstract]                      
Segment Margin                 $ 259,017 $ 154,779 $ 110,182
Depreciation and amortization                 (132,832) (120,811) (106,186)
General and administrative                 (67,318) (52,047) (37,478)
Bad debt (expense) recovery                 (925) (493) 1,642
Impairment of equipment                 (484) 0 0
Income (loss) from operations $ 20,297 $ 19,324 $ 11,918 $ 5,919 $ 6,864 $ 2,536 $ (7,856) $ (20,116) $ 57,458 $ (18,572) $ (31,840)