Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Income Statement [Abstract]
Revenues	$ 143,714	$ 137,279	$ 260,292	$ 250,476
Operating expenses:
Cost of operations	98,737	97,218	186,569	183,622
General and administration	18,071	15,594	34,876	31,981
Depreciation and amortization	16,241	17,167	29,990	30,775
Divestiture transactions	(677)	7,455	(5,611)	7,455
Development project charge		(46)		1,394
Severance and reorganization costs		350		430
Expense from divestiture, acquisition and financing costs		14		24
Gain on settlement of acquisition related contingent consideration				(1,058)
Total operating expenses	132,372	137,752	245,824	254,623
Operating income (loss)	11,342	(473)	14,468	(4,147)
Other expense (income):
Interest income	(70)	(85)	(211)	(195)
Interest expense	10,150	9,588	20,276	19,194
Loss on debt extinguishment			521
Loss on derivative instruments	47	298	198	448
Income from equity method investments		(63)		(90)
Loss on sale of equity method investment				221
Other income	(46)	(361)	(209)	(568)
Other expense (income), net	10,081	9,377	20,575	19,010
Income (loss) before income taxes	1,261	(9,850)	(6,107)	(23,157)
Provision for income taxes	318	528	914	831
Net income (loss)	943	(10,378)	(7,021)	(23,988)
Less: Net (loss) income attributable to noncontrolling interests	(82)	(3,723)	1,226	(3,910)
Net income (loss) attributable to common stockholders	$ 1,025	$ (6,655)	$ (8,247)	$ (20,078)
Basic earnings per share attributable to common stockholders:
Weighted average common shares outstanding	40,447	39,995	40,432	39,952
Basic earnings per common share	$ 0.03	$ (0.17)	$ (0.20)	$ (0.50)
Diluted earnings per share attributable to common stockholders:
Weighted average common shares outstanding	40,846	39,995	40,432	39,952
Diluted earnings per common share	$ 0.03	$ (0.17)	$ (0.20)	$ (0.50)