Segments - Selected Financial Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Segment Reporting Information [Line Items]
Revenues	$ 270,564	$ 186,832	$ 527,155	$ 338,032
Cost of revenues	234,330	161,951	457,534	287,912
Gross profit	36,234	24,881	69,621	50,120
Selling, general and administrative expenses	28,392	25,550	60,462	50,404
Operating loss	6,685	(669)	8,002	(284)
Interest expense	11,467	9,233	23,154	17,144
Loss before income taxes	(4,767)	(9,902)	(15,106)	(17,428)
Income tax expense (benefit)	116	(3,665)	65	(6,389)
Net loss	(4,883)	(6,237)	(15,171)	(11,039)
Restructuring expense	2,726		2,726
Other operating income	(1,569)		(1,569)
Other income	(15)		(46)
PS
Segment Reporting Information [Line Items]
Revenues	24,415	29,215	46,612	49,300
Cost of revenues	23,758	22,741	44,973	39,730
Gross profit	657	6,474	1,639	9,570
IS
Segment Reporting Information [Line Items]
Revenues	182,409	157,617	357,035	288,732
Cost of revenues	153,113	139,210	299,347	248,182
Gross profit	29,296	18,407	57,688	40,550
FS
Segment Reporting Information [Line Items]
Revenues	63,740		123,508
Cost of revenues	57,459		113,214
Gross profit	6,281		10,294
Corporate
Segment Reporting Information [Line Items]
Selling, general and administrative expenses	28,392	25,550	60,462	50,404
Interest expense	11,467	9,233	23,154	17,144
Income tax expense (benefit)	116	(3,665)	65	(6,389)
Restructuring expense	2,726		2,726
Other operating income	(1,569)		(1,569)
Other income	$ (15)		$ (46)