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Consolidated Statements of Operations (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Income Statement [Abstract]    
Revenues $ 125,432 $ 116,577
Operating expenses:    
Cost of operations 90,418 87,833
General and administration 18,587 16,805
Depreciation and amortization 14,453 13,748
Divestiture transactions   (4,935)
Total operating expenses 123,458 113,451
Operating income 1,974 3,126
Other expense (income):    
Interest income (104) (141)
Interest expense 10,030 10,126
(Gain) loss on debt extinguishment (48) 521
Loss on derivative instruments   151
Other income (141) (164)
Other expense, net 9,737 10,493
Loss before income taxes (7,763) (7,367)
(Benefit) provision for income taxes (149) 596
Net loss (7,614) (7,963)
Less: Net (loss) income attributable to noncontrolling interests (6) 1,308
Net loss attributable to common stockholders $ (7,608) $ (9,271)
Basic and diluted earnings per share attributable to common stockholders:    
Weighted average common shares outstanding 40,996 40,417
Basic and diluted earnings per share $ (0.19) $ (0.23)