CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
CONSOLIDATED STATEMENTS OF OPERATIONS
Revenues	$ 4,175,672	$ 4,111,471	$ 3,716,317
Cost of operations	3,708,768	3,696,339	3,320,976
Gross profit	466,904	415,132	395,341
General and administrative expenses	263,082	260,369	226,965
Goodwill and intangible asset impairment		376,574
INCOME (LOSS) FROM CONSTRUCTION OPERATIONS	203,822	(221,811)	168,376
Other (expense) income, net	(18,575)	(1,857)	4,421
Interest expense	(45,632)	(44,174)	(35,750)
Income (Loss) before income taxes	139,615	(267,842)	137,047
(Provision) benefit for income taxes	(52,319)	2,442	(50,899)
NET INCOME (LOSS)	$ 87,296	$ (265,400)	$ 86,148
BASIC EARNINGS (LOSS) PER COMMON SHARE (in dollars per share)	$ 1.82	$ (5.59)	$ 1.82
DILUTED EARNINGS (LOSS) PER COMMON SHARE (in dollars per share)	$ 1.80	$ (5.59)	$ 1.80
WEIGHTED AVERAGE COMMON SHARES OUTSTANDING:
BASIC (in shares)	47,851	47,470	47,226
Effect of dilutive stock options and restricted stock units (in shares)	738		664
DILUTED (in shares)	48,589	47,470	47,890