Condensed Consolidated Statements of Operations (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Revenues	$ 296,964	$ 268,132	$ 812,254	$ 795,431
Cost of revenues	228,661	218,864	639,932	654,309
Selling, general and administrative expenses	28,754	23,846	82,258	69,545
Other operating expense (income), net	117	(223)	(1,941)	(525)
Operating income	39,432	25,645	92,005	72,102
Foreign currency exchange loss (gain)	1,221	975	(530)	1,082
Interest expense, net	2,321	2,728	8,071	8,050
Income from continuing operations before income taxes	35,890	21,942	84,464	62,970
Provision for income taxes	12,398	6,511	28,901	20,813
Income from continuing operations	23,492	15,431	55,563	42,157
Income from discontinued operations, net of tax		3,329	1,152	9,642
Gain from disposal of discontinued operations, net of tax			22,117
Net income	$ 23,492	$ 18,760	$ 78,832	$ 51,799
Income per common share -basic:
Income from continuing operations (in Dollars per share)	$ 0.29	$ 0.18	$ 0.67	$ 0.50
Income from discontinued operations (in Dollars per share)		$ 0.04	$ 0.28	$ 0.11
Net income (in Dollars per share)	$ 0.29	$ 0.22	$ 0.95	$ 0.61
Income per common share -diluted:
Income from continuing operations (in Dollars per share)	$ 0.25	$ 0.16	$ 0.59	$ 0.45
Income from discontinued operations (in Dollars per share)		$ 0.04	$ 0.23	$ 0.09
Net income (in Dollars per share)	$ 0.25	$ 0.20	$ 0.82	$ 0.54