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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 $ 87,160 $ 51,171
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 95,959 91,798
Deferred taxes (12,553) 7,436
Compensation expense related to share-based compensation plans 14,090 12,676
(Gain) loss on sale of assets (8,978) 94
Other operating activity 0 5,626
Changes in operating assets and liabilities:    
Restricted investments 253 1,085
Accounts receivable, net (100,102) (105,918)
Prepaid taxes 1,248 (1,154)
Prepaid expenses and other current assets (6,059) 10,379
Other assets (1,670) (429)
Accounts payable 81,908 61,549
Accrued expenses 33,424 (17,834)
Non-current liabilities (6,622) 6,209
Net cash provided by operating activities 178,058 122,688
Cash flows from investing activities:    
Proceeds from sale of equipment 30,558 1,298
Purchases of property and equipment (84,076) (55,352)
Cash used in acquisition (90) 0
Net cash used in investing activities (53,608) (54,054)
Cash flows from financing activities:    
Proceeds from issuance of debt 70,695 128,762
Repayments of long-term debt (82,804) (174,419)
Stock withheld for payments of withholding taxes (4,038) (4,041)
Finance lease payments (2,142) (2,278)
Net cash used in financing activities (18,289) (51,976)
Effect of exchange rate changes on cash and cash equivalents (11) (51)
Net increase in cash and cash equivalents 106,150 16,607
Cash and cash equivalents beginning of the period 124,506 168,729
Cash and cash equivalents end of the period 230,656 185,336
Supplemental disclosures of cash paid for:    
Interest 5,621 7,331
Income taxes $ 21,867 $ 12,406