Condensed Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Income Statement [Abstract]
Revenues	$ 243,164	$ 215,734
Cost of Revenues	208,604	184,912
Gross Profit	34,560	30,822
Selling, General and Administrative Expenses	15,199	15,214
Amortization Expense	321	332
Operating Income	19,040	15,276
Interest and Other Expense	4,396	1,750
Income Before Provision for Income Taxes	14,644	13,526
Provision for Income Taxes	3,514	3,673
Net Income	$ 11,130	$ 9,853
Earnings per Common Share:
Basic (in dollars per share)	$ 0.36	$ 0.33
Diluted (in dollars per share)	$ 0.36	$ 0.32
Weighted Average Shares Outstanding:
Basic (in shares)	30,513	30,219
Diluted (in shares)	30,694	30,574