CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Income Statement [Abstract]
Revenues	$ 133,802	$ 125,432
Operating expenses:
Cost of operations	94,544	90,418
General and administration	18,845	18,587
Depreciation and amortization	13,849	14,453
Total operating expenses	127,238	123,458
Operating income	6,564	1,974
Other expense (income):
Interest income	(69)	(104)
Interest expense	6,450	10,030
Loss (gain) on debt extinguishment	472	(48)
Other income	(81)	(141)
Other expense, net	6,772	9,737
Loss before income taxes	(208)	(7,763)
Provision (benefit) for income taxes	16	(149)
Net loss	(224)	(7,614)
Less: Net loss attributable to noncontrolling interests	0	(6)
Net loss attributable to common stockholders	$ (224)	$ (7,608)
Basic and diluted earnings per share attributable to common stockholders:
Basic and diluted weighted average common shares outstanding (in shares)	41,584	40,996
Basic and diluted earnings per common share (in USD per share)	$ (0.01)	$ (0.19)