Condensed Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Income Statement [Abstract]
Revenues	$ 198,349	$ 153,604	$ 566,893	$ 512,147
Cost of Revenues	173,199	134,685	497,539	443,192
Gross Profit	25,150	18,919	69,354	68,955
Selling, General and Administrative Expenses	14,136	14,126	45,557	46,502
Amortization Expense	332	327	990	978
Operating Income	10,682	4,466	22,807	21,475
Interest and Other Expense	3,482	4,799	14,786	14,583
Income (Loss) Before Provision for Income Taxes	7,200	(333)	8,021	6,892
Provision (Benefit) for Income Taxes	2,437	(1,480)	2,498	461
Net Income	$ 4,763	$ 1,147	$ 5,523	$ 6,431
Earnings per Common Share:
Basic and Diluted (in dollars per share)	$ 0.16	$ 0.04	$ 0.18	$ 0.22
Weighted Average Shares Outstanding:
Basic (in shares)	29,875	29,449	29,874	29,449
Diluted (in shares)	30,487	30,101	30,379	29,783