CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Cash flows from operating activities:
Net income	$ 13,633	$ 21,421
Adjustments to reconcile net income to net cash flows provided by operating activities —
Depreciation and amortization of property and equipment	28,747	27,767
Amortization of intangible assets	691	251
Stock-based compensation expense	3,488	3,843
Deferred income taxes	(116)	(186)
Gain on sale of property and equipment	(1,079)	(1,574)
Other non-cash items	(38)	175
Changes in operating assets and liabilities
Accounts receivable, net	1,770	(24,301)
Costs and estimated earnings in excess of billings on uncompleted contracts	(28,774)	(31,319)
Receivable for insurance claims in excess of deductibles	(1,640)	920
Other assets	7,008	(1,234)
Accounts payable	11,022	17,014
Billings in excess of costs and estimated earnings on uncompleted contracts	5,454	6,079
Accrued self insurance	299	(3,387)
Other liabilities	32	(4,774)
Net cash flows provided by operating activities	40,497	10,695
Cash flows from investing activities:
Proceeds from sale of property and equipment	2,544	1,980
Cash paid for acquired business	0	(11,374)
Purchases of property and equipment	(17,948)	(42,795)
Net cash flows used in investing activities	(15,404)	(52,189)
Cash flows from financing activities:
Net borrowings under revolving lines of credit	33,407	0
Payment of principal obligations under capital leases	(442)	0
Increase in outstanding checks	2,540	0
Proceeds from exercise of stock options	2,080	1,823
Debt issuance costs	(1,006)	0
Excess tax benefit from stock-based awards	480	1,676
Repurchase of common shares	(101,483)	(9,240)
Other financing activities	63	28
Net cash flows used in financing activities	(64,361)	(5,713)
Effect of exchange rate changes on cash	55	0
Net decrease in cash and cash equivalents	(39,213)	(47,207)
Cash and cash equivalents:
Beginning of period	39,797	77,636
End of period	584	30,429
Noncash investing activities:
Acquisition of property and equipment acquired under capital lease arrangements	5,580	0
Noncash financing activities:
Capital lease obligations initiated	$ 5,580	$ 0