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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Cash flows from operating activities:      
Net income $ 65,123 $ 42,904 $ 40,695
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 34,201 32,785 20,740
Amortization of debt issuance costs and non-cash interest 2,242 3,193 3,393
Gain on disposal of property and equipment (1,396) (1,495) (527)
(Gain) loss on debt extinguishment (2,032) 301 4,334
Deferred taxes 21,428 19,439 (27,398)
Stock-based compensation expense 11,771 11,643 3,788
Change in fair value of interest rate swap (32) 265 (30)
Changes in operating assets and liabilities 20,289 11,876 (2,928)
Net cash provided by operating activities 151,594 120,911 42,067
Cash flows from investing activities:      
Acquisitions, net of cash acquired (180,911) 0 (396,323)
Capital expenditures (46,651) (32,864) (15,397)
Proceeds from sale of property and equipment 4,113 2,373 1,334
Net cash used in investing activities (223,449) (30,491) (410,386)
Cash flows from financing activities:      
Cash received from credit facility 140,000 0 430,000
Repayments of debt (48,273) (77,745) (87,621)
Distributions to noncontrolling interest owners (2,477) (432) (7,360)
Purchase of treasury stock 0 0 (3,201)
Debt issuance costs (1,340) 0 (10,688)
Other (4) 9,837 (199)
Net cash provided by (used in) financing activities 87,906 (68,340) 320,931
Net change in cash, cash equivalents, and restricted cash 16,051 22,080 (47,388)
Cash, cash equivalents, and restricted cash at beginning of period 72,642 50,562 97,950
Cash, cash equivalents, and restricted cash at end of period 88,693 72,642 50,562
Less: restricted cash (Other current assets) (6,853) (6,457) (4,829)
Cash and cash equivalents at end of period 81,840 66,185 45,733
Supplemental disclosures of cash flow information:      
Cash paid during the period for interest 17,236 26,941 11,566
Cash paid during the period for income taxes 3,061 4,745 94
Non-cash items:      
Equity consideration transferred 20,406 0 16,195
Notes and deferred payments to sellers 0 0 10,000
Tax basis election and other payments due to sellers 10,833 0 5,015
Capital expenditures $ 264 $ 0 $ 0