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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Cash Flows from Operating Activities:        
Net income $ 28,459 $ 74,706 $ 149,494 $ 113,317
Adjustments to reconcile net income to net cash provided by (used in) operating activities—        
Depreciation 53,811 50,034 106,027 98,753
Amortization of intangible assets 12,610 10,507 25,280 20,912
Change in fair value of contingent consideration liabilities 4,371 (6,279) 4,287 (6,279)
Equity in (earnings) losses of unconsolidated affiliates (1,757) 11,798 (62,147) 25,141
Amortization of debt issuance costs 408 288 816 576
(Gain) loss on sale of property and equipment (2,411) 982 (2,470) 1,945
Foreign currency (gain) loss 3 582 1,220 (69)
Provision for doubtful accounts 416 139 3,239 984
Deferred income tax provision (benefit) 19,573 (2,872) 44,131 13,505
Non-cash stock-based compensation 14,484 13,485 27,496 28,172
Bargain purchase gain (3,138) 0 (3,138) 0
Changes in operating assets and liabilities, net of non-cash transactions (235,493) 3,150 (485,649) (114,444)
Net cash provided by (used in) operating activities (108,664) 156,520 (191,414) 182,513
Cash Flows from Investing Activities:        
Capital expenditures (72,775) (81,784) (141,401) (148,591)
Proceeds from sale of property and equipment 8,550 7,224 19,393 12,993
Proceeds from insurance settlements related to property and equipment 3 365 11 365
Cash paid for acquisitions, net of cash, cash equivalents and restricted cash acquired (3,780) (15,506) (55,333) (46,234)
Investments in unconsolidated affiliates and other entities (127) (731) (37,930) (1,569)
Cash received from investments in unconsolidated affiliates and other entities 0 78 0 784
Cash paid for intangible assets (42) (3,000) (67) (3,000)
Net cash used in investing activities (68,171) (93,354) (215,327) (185,252)
Cash Flows from Financing Activities:        
Borrowings under credit facility 1,068,439 1,062,445 2,715,513 2,037,393
Payments under credit facility (901,396) (1,101,561) (2,248,838) (1,861,930)
Payments on other long-term debt (222) (385) (483) (731)
Net repayments of short-term debt, net of borrowings 7,304 12,942 (15,916) 12,942
Distributions to non-controlling interests (1,092) (687) (1,620) (1,667)
Payments related to tax withholding for stock-based compensation (1,666) (1,583) (15,344) (14,204)
Payments of dividends (5,830) 0 (11,582) 0
Repurchase of common stock (159) (15,993) (20,092) (189,906)
Net cash provided by (used in) financing activities 165,378 (44,822) 401,638 (18,103)
Effect of foreign exchange rate changes on cash, cash equivalents and restricted cash 82 1,113 (36) 1,804
Net increase (decrease) in cash, cash equivalents and restricted cash (11,375) 19,457 (5,139) (19,038)
Cash, cash equivalents and restricted cash, beginning of period 89,492 105,280 83,256 143,775
Cash, cash equivalents and restricted cash, end of period $ 78,117 $ 124,737 $ 78,117 $ 124,737