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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Cash flows from operating activities:      
Net income $ 21,431 $ 27,302 $ 36,544
Adjustments to reconcile net income to net cash flows provided by operating activities -      
Depreciation and amortization of property and equipment 38,236 37,458 33,089
Amortization of intangible assets 886 571 334
Stock-based compensation expense 4,674 4,837 4,671
Deferred income taxes 4,205 1,558 3,655
Gain on sale of property and equipment (1,341) (2,257) (142)
Other non-cash items 194 200 139
Changes in operating assets and liabilities, net of acquisitions      
Accounts receivable, net (27,485) (17,765) 15,706
Costs and estimated earnings in excess of billings on uncompleted contracts (17,001) (4,597) (4,090)
Receivable for insurance claims in excess of deductibles (7,187) 1,021 (922)
Other assets 3,730 (5,634) (1,255)
Accounts payable 17,322 6,742 (17,303)
Billings in excess of costs and estimated earnings on uncompleted contracts (707) 1,003 (14,831)
Accrued self insurance 5,617 (2,616) 369
Other liabilities 11,916 (4,823) (988)
Net cash flows provided by operating activities 54,490 43,000 54,976
Cash flows from investing activities:      
Proceeds from sale of property and equipment 3,299 2,758 320
Cash paid for acquisitions, net of cash acquired (12,056) (13,087) 0
Purchases of property and equipment (25,371) (46,599) (39,045)
Net cash flows used in investing activities (34,128) (56,928) (38,725)
Cash flows from financing activities:      
Net borrowings under revolving lines of credit 59,070 0 0
Payment of principal obligations under capital leases (740) 0 0
Proceeds from exercise of stock options 6,218 1,923 725
Debt issuance costs (1,012) 0 0
Excess tax benefit from stock-based awards 2,345 1,720 615
Repurchase of common shares (101,483) (27,582) (16,447)
Other financing activities 63 28 38
Net cash flows used in financing activities (35,539) (23,911) (15,069)
Effect of exchange rate changes on cash (774) 0 0
Net increase (decrease) in cash and cash equivalents (15,951) (37,839) 1,182
Cash and cash equivalents:      
Beginning of period 39,797 77,636 76,454
End of period 23,846 39,797 77,636
Supplemental Cash Flow Information:      
Income taxes payments 6,274 16,960 17,403
Interest payments 1,114 591 577
Noncash investing activities:      
Acquisition of property and equipment for which payment is pending 614 1,328 749
Acquisition of property under capital lees arrangements 5,658 0 0
Noncash financing activities:      
Capital lease obligations initiated 5,658 0 0
Share repurchases that have not settled $ 0 $ 896 $ 0