CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS [Abstract]
REVENUE	$ 1,085,369	$ 1,066,465
COST OF OPERATIONS	(980,277)	(975,706)
GROSS PROFIT	105,092	90,759
General and administrative expenses	(64,970)	(70,675)
INCOME FROM CONSTRUCTION OPERATIONS	40,122	20,084
Other income (expense), net	682	(754)
Interest expense	(14,080)	(11,125)
INCOME BEFORE INCOME TAXES	26,724	8,205
Provision for income taxes	(11,324)	(3,079)
NET INCOME	$ 15,400	$ 5,126
BASIC EARNINGS PER COMMON SHARE (in dollars per share)	$ 0.31	$ 0.11
DILUTED EARNINGS PER COMMON SHARE (in dollars per share)	$ 0.31	$ 0.10
WEIGHTED AVERAGE COMMON SHARES OUTSTANDING:
BASIC (in shares)	49,079	48,747
DILUTED (in shares)	49,285	49,543