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UNAUDITED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Cash flows from operating activities:    
Net income $ 23,894 $ 16,167
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 28,383 18,599
Deferred taxes 6,335 4,714
Compensation expense related to share-based compensation plans 4,933 3,501
Gain on sale of assets (835) (115)
Changes in operating assets and liabilities:    
Restricted investments (1,841) 916
Accounts receivable, net 32,906 11,643
Prepaid taxes 447 (47)
Prepaid expenses and other current assets 12,560 6,694
Other assets (819) 1,866
Accounts payable (14,389) (19,465)
Accrued expenses (30,123) (10,913)
Non-current liabilities 1,982 (386)
Net cash provided by operating activities 63,433 33,174
Cash flows from investing activities:    
Proceeds from sale of equipment 3,799 516
Purchases of property and equipment (17,057) (22,179)
Proceeds from the disposition of discontinued operations 19,439  
Net cash provided by (used in) investing activities 6,181 (21,663)
Cash flows from financing activities:    
Proceeds from issuance of debt 10,456 16,783
Repayments of long term debt (25,780) (34,300)
Stock tendered for payments of withholding taxes (2,578) (3,896)
Finance lease payments (740) (695)
Net cash used in financing activities (18,642) (22,108)
Effect of exchange rate changes on cash and cash equivalents (5) (30)
Net increase (decrease) in cash and cash equivalents 50,967 (10,627)
Cash and cash equivalents beginning of the period 61,435 28,557
Cash and cash equivalents end of the period 112,402 17,930
Supplemental disclosures of cash paid for:    
Interest 2,749 2,315
Income taxes $ 191 $ 194