Segments - Selected Financial Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Segment Reporting Information [Line Items]
Revenues	$ 165,494	$ 363,790	$ 565,540	$ 890,945
Cost of revenues	143,566	300,767	497,657	758,301
Gross profit (exclusive of depreciation and amortization included in selling, general and administrative expense shown below)	21,928	63,023	67,883	132,644
Selling, general and administrative expenses	22,610	27,924	72,784	88,386
Restructuring expense	501	4,653	9,510	7,379
Impairment expense		1,754	2,775	1,754
Other operating income		(1,666)		(3,235)
Operating income (loss)	(1,183)	30,358	(17,186)	38,360
Other income		(25)		(71)
Interest expense, net	11,053	11,188	32,925	34,342
Income (Loss) before income taxes	(12,236)	19,195	(50,111)	4,089
Income tax expense	87	2,092	484	2,157
Net income (loss)	(12,323)	17,103	(50,595)	1,932
Operating Segments | PS
Segment Reporting Information [Line Items]
Revenues	18,760	24,801	49,164	71,412
Cost of revenues	14,385	22,717	43,736	67,690
Gross profit (exclusive of depreciation and amortization included in selling, general and administrative expense shown below)	4,375	2,084	5,428	3,722
Operating Segments | IS
Segment Reporting Information [Line Items]
Revenues	74,436	267,192	324,862	624,228
Cost of revenues	69,717	220,769	296,974	520,116
Gross profit (exclusive of depreciation and amortization included in selling, general and administrative expense shown below)	4,719	46,423	27,888	104,112
Operating Segments | FS
Segment Reporting Information [Line Items]
Revenues	72,298	71,797	191,514	195,305
Cost of revenues	59,464	57,281	156,947	170,495
Gross profit (exclusive of depreciation and amortization included in selling, general and administrative expense shown below)	12,834	14,516	34,567	24,810
Corporate
Segment Reporting Information [Line Items]
Selling, general and administrative expenses	22,610	27,924	72,784	88,386
Restructuring expense	501	4,653	9,510	7,379
Impairment expense		1,754	2,775	1,754
Other operating income		(1,666)		(3,235)
Other income		(25)		(71)
Interest expense, net	11,053	11,188	32,925	34,342
Income tax expense	$ 87	$ 2,092	$ 484	$ 2,157