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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Cash flows from operating activities:      
Net income $ 42,904 $ 40,695 $ 29,540
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 32,785 20,740 16,770
Amortization of debt issuance costs and non-cash interest 3,193 3,393 3,250
Gain on disposal of property and equipment (1,495) (527) (580)
Loss on debt extinguishment 301 4,334 0
Deferred taxes 19,439 (27,398) 1,450
Stock-based compensation expense 11,643 3,788 3,064
Change in interest rate swap 265 (30) 0
Changes in operating assets and liabilities 10,248 (3,902) (14,020)
Net cash provided by operating activities 119,283 41,093 39,474
Cash flows from investing activities:      
Plateau acquisition, net of cash acquired 0 (396,323) 0
Capital expenditures (32,864) (15,397) (13,171)
Proceeds from sale of property and equipment 2,373 1,334 1,789
Net cash used in investing activities (30,491) (410,386) (11,382)
Cash flows from financing activities:      
Cash received from credit facility 0 430,000 0
Repayments of debt (77,745) (87,621) (11,555)
Distributions to noncontrolling interest owners (432) (7,360) (1,350)
Purchase of treasury stock 0 (3,201) (4,731)
Debt issuance costs 0 (10,688) 0
Other 9,837 (199) (314)
Net cash (used in) provided by financing activities (68,340) 320,931 (17,950)
Net change in cash and cash equivalents 20,452 (48,362) 10,142
Cash and cash equivalents at beginning of period 45,733 94,095 83,953
Cash and cash equivalents at end of period 66,185 45,733 94,095
Supplemental disclosures of cash flow information:      
Cash paid during the period for interest 26,941 11,566 10,829
Cash paid during the period for income taxes 4,745 94 276
Non-cash items:      
Share consideration given for acquisitions 0 16,195 0
Notes and deferred payments to sellers 0 10,000 0
Tax basis election $ 0 $ 5,015 $ 0