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UNAUDITED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Cash flows from operating activities:    
Net income $ 13,236 $ 23,894
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 30,576 28,383
Deferred taxes 696 6,335
Compensation expense related to share-based compensation plans 4,097 4,933
Loss (gain) on sale of assets 121 (835)
Donated equipment 240  
Restricted investments 4,409 (1,841)
Accounts receivable, net (9,480) 32,906
Prepaid taxes (50) 447
Prepaid expenses and other current assets 9,054 12,560
Other assets (477) (819)
Accounts payable 19,657 (14,389)
Accrued expenses (28,551) (30,123)
Non-current liabilities (2,875) 1,982
Net cash provided by operating activities 40,653 63,433
Cash flows from investing activities:    
Proceeds from sale of equipment 497 3,799
Purchases of property and equipment (25,467) (17,057)
Proceeds from the disposition of discontinued operations   19,439
Net cash (used in) provided by investing activities (24,970) 6,181
Cash flows from financing activities:    
Proceeds from issuance of debt 121,444 10,456
Repayments of long-term debt (24,373) (25,780)
Stock withheld for payments of withholding taxes (3,769) (2,578)
Finance lease payments (747) (740)
Net cash provided by (used in) financing activities 92,555 (18,642)
Effect of exchange rate changes on cash and cash equivalents (87) (5)
Net increase in cash and cash equivalents 108,151 50,967
Cash and cash equivalents beginning of the period 168,729 61,435
Cash and cash equivalents end of the period 276,880 112,402
Supplemental disclosures of cash paid for:    
Interest 2,563 2,749
Income taxes $ 355 $ 191