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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 (loss) income $ (401,732) $ 4,136 $ 54,299
Adjustments to reconcile net (loss) income to net cash provided by operating activities      
Depreciation and amortization 101,672 120,669 133,713
Net loss (gain) on disposal of property and equipment 2,405 7,950 (3,803)
Bad debt expense 6,373 2,553 2,210
Amortization of debt issuance costs 688 688 688
Inventory write-downs 852 250 442
Equity-based compensation 5,764 15,485 10,371
Impairment of goodwill and trademark 276,016 4,396 17,894
Impairment and abandonment of property and equipment 7,910 3,715 6,657
Impairment of cost-method investment     2,000
Loss on divestitures 410 3,676  
Unrealized gain on short-term investment (1,799)    
Other operating items, net (407) 240 1,287
Changes in operating assets and liabilities      
Accounts receivable 142,873 57,908 36,537
Prepaid expenses and other assets 14,886 11,321 (9,115)
Accounts payable and accrued liabilities (50,101) (29,039) (20,771)
Net cash provided by operating activities 105,810 203,948 232,409
Cash flows from investing activities      
Working capital settlement   691  
Proceeds received from divestitures 197 24,872  
Purchase of property and equipment (21,239) (110,143) (165,360)
Investment in note receivable (3,000)    
Distribution from cost method investment 200    
Acquisitions, net of cash received   (10,000) (16,999)
Proceeds received from sales of property and equipment 18,449 17,223 13,998
Net cash used in investing activities (5,393) (77,357) (168,361)
Cash flows from financing activities      
Borrowings from revolving line of credit   5,000 60,000
Payments on long-term debt   (50,000) (90,000)
Payments of finance lease obligations (264) (883) (1,881)
Proceeds from share issuance 76 142 762
Contributions from (distributions to) noncontrolling interests 354 (349) (506)
Repurchase of common stock (10,876) (18,600) (16,562)
Contingent consideration     (1,106)
Net cash used in financing activities (10,710) (64,690) (49,293)
Effect of exchange rate changes on cash 64 130 (292)
Net increase in cash and cash equivalents 89,771 62,031 14,463
Cash and cash equivalents, beginning of period 79,268 17,237 2,774
Cash and cash equivalents, end of period 169,039 79,268 17,237
Supplemental cash flow disclosure:      
Cash paid for interest 1,838 2,716 5,243
Cash (refunds received) paid for income taxes, net (174) 1,793 (550)
Supplemental disclosure of noncash operating activities:      
Noncash settlement of accounts receivable 1,578    
Lease liabilities arising from obtaining right-of-use assets 9,322 119,358  
Supplemental disclosure of noncash investing activities:      
Capital expenditures included in accounts payable and accrued liabilities 5,733 $ 10,472 $ 17,910
Noncash proceeds received from sale of interest in a formerly consolidated joint venture $ 367