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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Cash flows from operating activities    
Net income (loss) $ 142,677 $ (118,142)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Depreciation and amortization 80,342 94,637
Change in non-cash lease expense 517 756
Share-based compensation 8,205 7,418
Amortization of debt issuance costs and discounts on debt 3,370 3,372
Loss on disposal of assets 747 817
Provision for credit losses 260 806
Deferred income taxes 325 612
Loss on debt extinguishment and modification 759 0
Impairment of goodwill and intangible assets 0 27,872
Change in fair value of derivative 0 1
Changes in operating assets and liabilities:    
Accounts receivable (7,325) 2,494
Prepaid expenses, inventories and other current assets (5,666) 2,150
Other assets (1,022) 661
Accounts payable and other accrued expenses 26,915 1,723
Other liabilities (806) (561)
Net cash provided by operating activities 249,298 24,616
Cash flows from investing activities    
Purchase of property and equipment, net of change in construction payables (20,828) (31,410)
Proceeds from disposal of property and equipment 329 637
Net cash used in investing activities (20,499) (30,773)
Cash flows from financing activities    
Repayments of revolving credit facility 0 (200,000)
Borrowings under revolving credit facility 0 200,000
Repayments of term loan (97,000) 0
Repayments of notes payable (3,284) (2,937)
Principal payments under finance leases (6,064) (1,706)
Tax withholding on share-based payments (6,832) (449)
Proceeds from issuance of common stock, net of costs 9 3
Proceeds from exercise of stock options 98 0
Net cash used in financing activities (113,073) (5,089)
Cash and cash equivalents    
Change in cash and cash equivalents 115,726 (11,246)
Balance, beginning of period 103,558 111,678
Balance, end of period 219,284 100,432
Supplemental cash flow disclosures    
Cash paid for interest 36,556 40,835
Cash received for income taxes, net 0 (741)
Non-cash investing and financing activities    
Payables incurred for capital expenditures 904 994
Assets acquired under finance lease obligations 0 559
Operating lease right-of-use assets obtained in exchange for lease obligations $ 37,429 $ 6,061