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UNAUDITED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Cash flows from operating activities:
Net income	$ 6,620	$ 5,644
Adjustments to reconcile net income to net cash flows provided by (used in) operating activities:
Depreciation and amortization of property and equipment	9,815	9,275
Amortization of intangible assets	734	117
Stock-based compensation expense	951	420
Deferred income taxes	(315)	48
Gain on sale of property and equipment	(471)	(1,051)
Other non-cash items	(56)	702
Changes in operating assets and liabilities:
Accounts receivable, net	(9,380)	23,663
Contract assets	(27,615)	(12,753)
Receivable for insurance claims in excess of deductibles	1,178	(290)
Other assets	(849)	1,405
Accounts payable	38,220	(3,765)
Contract liabilities	(30,033)	(12,333)
Accrued self insurance	(580)	(857)
Other liabilities	3,576	11,808
Net cash flows provided by (used in) operating activities	(8,205)	22,033
Cash flows from investing activities:
Proceeds from sale of property and equipment	832	1,074
Purchases of property and equipment	(9,911)	(14,497)
Net cash flows used in investing activities	(9,079)	(13,423)
Cash flows from financing activities:
Net borrowings (repayments) under revolving lines of credit	21,609	(11,578)
Payment of principal obligations under equipment notes	(1,455)	0
Payment of principal obligations under capital leases	(230)	(272)
Proceeds from exercise of stock options	282	581
Repurchase of common shares	(778)	(934)
Other financing activities	(8,364)	0
Net cash flows provided by (used in) financing activities	11,064	(12,203)
Effect of exchange rate changes on cash	51	(31)
Net decrease in cash and cash equivalents	(6,169)	(3,624)
Cash and cash equivalents:
Beginning of period	7,507	5,343
End of period	$ 1,338	$ 1,719

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