Condensed Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Income Statement [Abstract]
Revenues	$ 215,734	$ 173,416
Cost of Revenues	184,613	151,913
Gross Profit	31,121	21,503
Selling, General and Administrative Expenses	15,304	16,619
Amortization Expense	332	327
Operating Income	15,485	4,557
Interest and Other Expense	1,959	4,565
Income (Loss) Before Provision for Income Taxes	13,526	(8)
Provision (Benefit) for Income Taxes	3,673	(636)
Net Income	$ 9,853	$ 628
Earnings per Common Share:
Basic (in dollars per share)	$ 0.33	$ 0.02
Diluted (in dollars per share)	$ 0.32	$ 0.02
Weighted Average Shares Outstanding:
Basic (in shares)	30,219	29,872
Diluted (in shares)	30,574	30,194