CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Cash flows from operating activities:
Net income	$ 1,200	$ 1,987
Adjustments to reconcile net income to net cash flows provided by operating activities -
Depreciation and amortization of property and equipment	9,558	9,705
Amortization of intangible assets	188	211
Stock-based compensation expense	867	730
Deferred income taxes	(143)	(75)
Gain on sale of property and equipment	(707)	(96)
Other non-cash items	(93)	(61)
Changes in operating assets and liabilities
Accounts receivable, net	12,417	14,420
Costs and estimated earnings in excess of billings on uncompleted contracts	(2,847)	(20,071)
Receivable for insurance claims in excess of deductibles	(47)	2,733
Other assets	(289)	2,046
Accounts payable	(10,333)	8,004
Billings in excess of costs and estimated earnings on uncompleted contracts	7,134	4,026
Accrued self insurance	1,834	(3,378)
Other liabilities	(5,679)	(5,755)
Net cash flows provided by operating activities	13,060	14,426
Cash flows from investing activities:
Proceeds from sale of property and equipment	937	1,032
Purchases of property and equipment	(10,002)	(3,769)
Net cash flows used in investing activities	(9,065)	(2,737)
Cash flows from financing activities:
Net repayments under revolving lines of credit	(19,491)	0
Payment of principal obligations under capital leases	(268)	0
Proceeds from exercise of stock options	911	104
Excess tax benefit from stock-based awards	0	135
Repurchase of common shares	(2,208)	(25,686)
Net cash flows used in financing activities	(21,056)	(25,447)
Effect of exchange rate changes on cash	154	0
Net decrease in cash and cash equivalents	(16,907)	(13,758)
Cash and cash equivalents:
Beginning of period	23,846	39,797
End of period	6,939	26,039
Noncash investing activities:
Acquisition of property and equipment acquired under capital lease arrangements	0	745
Noncash financing activities:
Share repurchases not settled	0	2,691
Capital lease obligations initiated	$ 0	$ 745