Condensed Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Income Statement [Abstract]
Revenues	$ 225,399	$ 225,010	$ 711,753	$ 674,135
Cost of Revenues	194,195	192,833	612,207	575,550
Gross Profit	31,204	32,177	99,546	98,585
Selling, General and Administrative Expenses	17,531	15,613	48,976	45,177
Amortization Expense	437	321	1,080	980
Operating Income	13,236	16,243	49,490	52,428
Interest and Other Expense	3,800	3,442	15,687	8,404
Income Before Provision for Income Taxes	9,436	12,801	33,803	44,024
Provision for Income Taxes	916	218	6,976	8,393
Net Income	$ 8,520	$ 12,583	$ 26,827	$ 35,631
Earnings per Common Share:
Basic (in dollars per share)	$ 0.28	$ 0.42	$ 0.88	$ 1.18
Diluted (in dollars per share)	$ 0.28	$ 0.41	$ 0.87	$ 1.17
Weighted Average Shares Outstanding:
Basic (in shares)	30,581	30,219	30,547	30,219
Diluted (in shares)	30,852	30,638	30,829	30,575