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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Cash flows from operating activities:      
Net income $ 36,214 $ 31,294 $ 21,154
Adjustments to reconcile net income to net cash flows provided by (used in) operating activities:      
Depreciation and amortization of property and equipment 40,667 38,070 38,077
Amortization of intangible assets 3,849 1,843 499
Stock-based compensation expense 4,403 3,165 4,376
Deferred income taxes 3,602 3,649 (5,091)
Gain on sale of property and equipment (3,543) (3,832) (3,664)
Other non-cash items 1,029 237 1,194
Changes in operating assets and liabilities, net of acquisitions:      
Accounts receivable, net (39,710) (15,871) (35,944)
Contract assets (16,443) (28,141) (17,857)
Receivable for insurance claims in excess of deductibles (9,646) (9,229) (39)
Other assets (10,327) 2,280 (2,213)
Accounts payable 22,492 19,953 8,149
Contract liabilities 28,163 22,551 (14,317)
Accrued self-insurance 12,755 8,701 2,765
Other liabilities (8,606) 10,119 (6,287)
Net cash flows provided by (used in) operating activities 64,899 84,789 (9,198)
Cash flows from investing activities:      
Proceeds from sale of property and equipment 4,051 4,583 4,342
Cash paid for acquisitions, net of cash acquired (79,720) (47,082) 0
Purchases of property and equipment (57,828) (50,704) (30,843)
Net cash flows used in investing activities (133,497) (93,203) (26,501)
Cash flows from financing activities:      
Net borrowings (repayments) under revolving lines of credit 45,514 (20,655) 19,890
Payment of principal obligations under equipment notes (4,550) 0 0
Payment of principal obligations under finance leases (1,201) (1,081) (1,203)
Borrowings under equipment notes 35,068 31,486 0
Proceeds from exercise of stock options 341 1,897 1,232
Debt refinancing costs (1,122) 0 0
Repurchase of common shares (778) (1,043) (3,058)
Other financing activities 84 38 28
Net cash flows provided by financing activities 73,356 10,642 16,889
Effect of exchange rate changes on cash 132 (64) 307
Net increase (decrease) in cash and cash equivalents 4,890 2,164 (18,503)
Cash and cash equivalents:      
Beginning of period 7,507 5,343 23,846
End of period 12,397 7,507 5,343
Cash paid during the period for:      
Income taxes payments 13,381 7,247 6,597
Interest payments 5,737 3,097 2,259
Noncash investing activities:      
Acquisition of property and equipment for which payment is pending $ 43 $ 953 $ 2,050