Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Revenues	$ 1,038,019	$ 958,180	$ 715,954
Cost of revenues	846,529	744,176	576,920
Selling, general and administrative expenses	86,352	81,672	64,157
Other operating income, net	(759)	(432)	(3,127)
Operating income	105,897	132,764	78,004
Foreign currency exchange loss (gain)	749	522	(1,134)
Interest expense, net	9,740	9,226	10,267
Income from operations before income taxes	95,408	123,016	68,871
Provision for income taxes	35,376	42,999	27,245
Net income	$ 60,032	$ 80,017	$ 41,626
Income per common share -basic: (in Dollars per share)	$ 0.69	$ 0.89	$ 0.47
Income per common share -diluted: (in Dollars per share)	$ 0.62	$ 0.80	$ 0.46