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UNAUDITED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Cash flows from operating activities:    
Net income $ 12,978 $ 12,479
Adjustments to reconcile net income to net cash flows provided by operating activities:    
Depreciation and amortization of property and equipment 19,714 18,590
Amortization of intangible assets 1,469 236
Stock-based compensation expense 2,153 1,478
Deferred income taxes 23 323
Gain on sale of property and equipment (1,397) (2,065)
Other non-cash items 783 354
Changes in operating assets and liabilities:    
Accounts receivable, net (24,468) 7,071
Contract assets (14,218) (14,471)
Receivable for insurance claims in excess of deductibles 568 (330)
Other assets (3,552) 2,144
Accounts payable 27,242 (9,845)
Contract liabilities (5,035) 17,551
Accrued self insurance (692) (239)
Other liabilities (8,169) 11,990
Net cash flows provided by operating activities 7,399 45,266
Cash flows from investing activities:    
Proceeds from sale of property and equipment 1,658 2,426
Purchases of property and equipment (27,961) (28,019)
Net cash flows used in investing activities (26,303) (25,593)
Cash flows from financing activities:    
Net repayments under revolving lines of credit (5,896) (21,156)
Borrowings under equipment notes 24,038 0
Payment of principal obligations under equipment notes (1,455) 0
Payment of principal obligations under finance leases (575) (545)
Proceeds from exercise of stock options 284 1,887
Repurchase of common shares (778) (951)
Other financing activities 36 10
Net cash flows provided by (used in) financing activities 15,654 (20,755)
Effect of exchange rate changes on cash 98 (58)
Net decrease in cash and cash equivalents (3,152) (1,140)
Cash and cash equivalents:    
Beginning of period 7,507 5,343
End of period $ 4,355 $ 4,203