Quarterly report pursuant to Section 13 or 15(d)

Industry Segments Data (Reconciliation of reportable segment adjusted EBITDA) (Details)

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Industry Segments Data (Reconciliation of reportable segment adjusted EBITDA) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Reconciliation from Segment Totals to Consolidated [Abstract]        
Adjusted EBITDA $ 59,449 $ 63,101 $ 173,699 $ 171,380
Less depreciation and amortization expense (32,120) (30,653) (97,850) (93,298)
Less share-based compensation expense (1,395) (384) (3,990) (3,224)
Less non-cash contribution expense 0 0 (960) 0
Less net loss attributable to non-controlling interest (177) 0 (531) 0
Plus net loss (income) attributable to equity investment (164) 59 (117) 92
Less accretion expense (201) (190) (541) (456)
Operating income 25,392 31,933 69,710 74,494
Less Other expense, net (16,599) (16,715) (50,743) (60,597)
Income before income tax expense $ 8,793 $ 15,218 $ 18,967 $ 13,897