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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Cash flows from operating activities:      
Net income $ 27,302 $ 36,544 $ 34,759
Adjustments to reconcile net income to net cash flows provided by operating activities -      
Depreciation and amortization of property and equipment 37,458 33,089 28,860
Amortization of intangible assets 571 334 335
Stock-based compensation expense 4,837 4,671 3,519
Deferred income taxes 1,558 3,655 381
Gain on sale of property and equipment (2,257) (142) (893)
Other non-cash items 200 139 151
Changes in operating assets and liabilities, net of acquisitions      
Accounts receivable, net (17,765) 15,706 (6,227)
Costs and estimated earnings in excess of billings on uncompleted contracts (4,597) (4,090) 21,254
Receivable for insurance claims in excess of deductibles 1,021 (922) (10)
Other assets (5,634) (1,255) (2,138)
Accounts payable 6,742 (17,303) (5,289)
Billings in excess of costs and estimated earnings on uncompleted contracts 1,003 (14,831) 20,363
Accrued self insurance (2,616) 369 (472)
Other liabilities (4,823) (988) 469
Net cash flows provided by operating activities 43,000 54,976 95,062
Cash flows from investing activities:      
Proceeds from sale of property and equipment 2,758 320 1,151
Cash paid for acquisitions, net of cash acquired (13,087) 0 0
Purchases of property and equipment (46,599) (39,045) (42,725)
Net cash flows used in investing activities (56,928) (38,725) (41,574)
Cash flows from financing activities:      
Proceeds from exercise of stock options 1,923 725 2,304
Excess tax benefit from stock-based awards 1,720 615 1,323
Repurchase of common shares (27,582) (16,447) (542)
Other financing activities 28 38 56
Net cash flows provided by (used in) financing activities (23,911) (15,069) 3,141
Net increase (decrease) in cash and cash equivalents (37,839) 1,182 56,629
Cash and cash equivalents:      
Beginning of period 77,636 76,454 19,825
End of period 39,797 77,636 76,454
Supplemental Cash Flow Information:      
Income taxes payments 16,960 17,403 18,115
Interest payments 591 577 571
Noncash investing activities:      
Acquisition of property and equipment for which payment is pending 1,328 749 804
Noncash financing activities:      
Share repurchases that have not settled $ 896 $ 0 $ 0