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UNAUDITED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Cash flows from operating activities:    
Net income $ 51,171 $ 79,216
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 91,798 86,719
Deferred taxes 7,436 7,145
Compensation expense related to share-based compensation plans 12,676 12,434
Loss (gain) on sale of assets 94 (1,313)
Donated equipment 5,626  
Changes in operating assets and liabilities:    
Restricted investments 1,085 (2,192)
Accounts receivable, net (105,918) 41,000
Prepaid taxes (1,154) (4,622)
Prepaid expenses and other current assets 10,379 1,299
Other assets (429) (3,365)
Accounts payable 61,549 (89,800)
Accrued expenses (17,834) 2,408
Non-current liabilities 6,209 (225)
Net cash provided by operating activities 122,688 128,704
Cash flows from investing activities:    
Proceeds from sale of equipment 1,298 9,072
Purchases of property and equipment (55,352) (55,616)
Acquisitions, net of cash acquired   (734)
Proceeds from the disposition of discontinued operations   19,439
Net cash used in investing activities (54,054) (27,839)
Cash flows from financing activities:    
Proceeds from issuance of debt 128,762 36,557
Repayments of long term debt (174,419) (79,147)
Stock withheld for payments of withholding taxes (4,041) (2,875)
Finance lease payments (2,278) (2,206)
Purchase of treasury stock   (24,998)
Net cash used in financing activities (51,976) (72,669)
Effect of exchange rate changes on cash and cash equivalents (51) (3)
Net increase in cash and cash equivalents 16,607 28,193
Cash and cash equivalents beginning of the period 168,729 61,435
Cash and cash equivalents end of the period 185,336 89,628
Supplemental disclosures of cash paid for:    
Interest 7,331 8,436
Income taxes $ 12,406 $ 32,917