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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Cash flows from operating activities:      
Net income $ 107,171 $ 201,740 $ 135,153
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 116,887 83,910 62,173
Deferred taxes 1,821 39,499 (41,351)
Compensation expense related to share-based compensation plans 16,286 13,480 9,873
Contingent consideration adjustment   (4,703)  
(Gain) loss on sale of assets (745) (1,007) 441
Gain on Disposition   (132,448)  
Transaction costs for Disposition   (5,798)  
Changes in operating assets and liabilities:      
Restricted investments (3,365) 827 (3,304)
Accounts receivable, net 32,732 (31,475) (84,775)
Prepaid taxes (14) 11,472 (11,794)
Prepaid expenses and other current assets 3,447 (1,750) (7,543)
Other assets (3,786) (8,029) 56
Accounts payable (14,933) 5,521 59,037
Accrued expenses (122) 43,476 (2,931)
Non-current liabilities (870) (3,876) 10,185
Net cash provided by operating activities 254,509 210,839 125,220
Cash flows from investing activities:      
Proceeds from sale of equipment 10,025 10,975 5,327
Purchases of property and equipment (94,847) (199,791) (74,541)
Acquisitions, net of cash acquired (734) (248,656) (165,933)
Proceeds from the disposition of discontinued operations 19,439 227,986  
Net cash used in investing activities (66,117) (209,486) (235,147)
Cash flows from financing activities:      
Proceeds from issuance of debt 56,494 172,146 98,544
Repayments of long-term debt (105,653) (133,436) (79,869)
Stock tendered for payments of withholding taxes (3,984) (4,270) (3,412)
Purchase of treasury stock (24,998)    
Finance lease payments (2,954) (2,889) (2,800)
Payment of debt issuance costs     (1,397)
Net cash (used in) provided by financing activities (81,095) 31,551 11,066
Effect of exchange rate changes on cash and cash equivalents (3) (26) 14
Net increase (decrease) in cash and cash equivalents 107,294 32,878 (98,847)
Cash and cash equivalents beginning of the year 61,435 28,557 127,404
Cash and cash equivalents end of the year 168,729 61,435 28,557
Supplemental disclosures of cash paid for:      
Interest 11,262 9,677 6,162
Income taxes $ 40,289 $ 13,606 $ 13,149