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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Cash flows from operating activities    
Net income (loss) $ 113,626 $ (111,186)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:    
Depreciation and amortization 53,868 63,086
Change in non-cash lease expense 660 331
Share-based compensation 5,255 3,908
Amortization of debt issuance costs and discounts on debt 2,329 2,236
Loss on disposal of assets 819 1,291
Provision for credit losses 217 461
Deferred income taxes 433 629
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 (67,122) 2,023
Prepaid expenses, inventories and other current assets (7,095) 5,525
Other assets (872) 192
Accounts payable and other accrued expenses 17,793 (1,790)
Other liabilities (540) (5,034)
Net cash provided by (used in) operating activities 119,371 (10,455)
Cash flows from investing activities    
Purchase of property and equipment, net of change in construction payables (11,438) (22,224)
Proceeds from disposal of property and equipment 226 353
Net cash used in investing activities (11,212) (21,871)
Cash flows from financing activities    
Repayments of revolving credit facility 0 (190,000)
Borrowings under revolving credit facility 0 200,000
Repayments of term loan (47,000) 0
Repayments of notes payable (2,815) (1,842)
Principal payments under finance leases (5,924) (925)
Tax withholding on share-based payments (3,561) (428)
Proceeds from issuance of common stock, net of costs 7 2
Proceeds from exercise of stock options 98 0
Net cash (used in) provided by financing activities (59,195) 6,807
Cash and cash equivalents    
Change in cash and cash equivalents 48,964 (25,519)
Balance, beginning of period 103,558 111,678
Balance, end of period 152,522 86,159
Supplemental cash flow disclosures    
Cash paid for interest 29,533 33,102
Non-cash investing and financing activities    
Payables incurred for capital expenditures 643 2,940
Operating lease right-of-use assets obtained in exchange for lease obligations $ 36,059 $ 3,491