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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Cash Flows from Operating Activities:    
Net income $ 38,611 $ 48,440
Adjustments to reconcile net income to net cash provided by (used in) operating activities—    
Depreciation 48,719 42,693
Amortization of intangible assets 10,405 6,562
Equity in losses of unconsolidated affiliates 13,343 603
Amortization of debt issuance costs 288 340
Loss on sale of property and equipment 963 1,841
Foreign currency (gain) loss (651) 221
Provision for doubtful accounts 845 865
Deferred income tax provision (benefit) 16,377 (36)
Non-cash stock-based compensation 14,687 11,866
Changes in operating assets and liabilities, net of non-cash transactions (117,594) (117,100)
Net cash provided by (used in) operating activities 25,993 (3,705)
Cash Flows from Investing Activities:    
Additions of property and equipment (66,807) (47,024)
Proceeds from sale of property and equipment 5,769 4,801
Proceeds from insurance settlements related to property and equipment 0 597
Cash paid for acquisitions, net of cash, cash equivalents and restricted cash acquired (30,728) (1,527)
Investments in and return of equity from unconsolidated affiliates (838) (3,725)
Cash received from (paid for) other investments, net 706 (1,701)
Net cash used in investing activities (91,898) (48,579)
Cash Flows from Financing Activities:    
Borrowings under credit facility 974,948 697,211
Payments under credit facility (760,369) (631,441)
Payments on other long-term debt (346) (1,529)
Payments on short-term debt 0 (2,783)
Distributions to non-controlling interests (980) (980)
Payments related to tax withholding for share-based compensation (12,621) (16,192)
Exercise of stock options 0 25
Repurchase of common stock (173,913) 0
Net cash provided by financing activities 26,719 44,311
Effect of foreign exchange rate changes on cash, cash equivalents and restricted cash 691 1,095
Net decrease in cash, cash equivalents and restricted cash (38,495) (6,878)
Cash, cash equivalents and restricted cash, beginning of period 143,775 114,410
Cash, cash equivalents and restricted cash, end of period $ 105,280 $ 107,532