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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Cash Flows from Operating Activities of Continuing Operations:      
Net income $ 296,007 $ 318,225 $ 200,098
Adjustments to reconcile net income to net cash provided by operating activities of continuing operations —      
Net loss from discontinued operations 0 0 342
Depreciation 202,519 183,808 170,240
Amortization of intangible assets 43,994 32,205 31,685
Asset impairment charges 49,375 58,057 7,964
Change in fair value of contingent consideration liabilities (11,248) (5,171) 0
Equity in losses of unconsolidated affiliates 52,867 10,945 979
Amortization of debt issuance costs 1,270 1,321 1,356
(Gain) loss on sale of property and equipment 3,296 (549) (734)
Foreign currency (gain) loss (385) 409 880
Provision for (recovery of) doubtful accounts 7,169 87 (543)
Deferred income tax expense (benefit) 61,974 (32,130) (15,695)
Non-cash stock-based compensation 52,484 46,448 42,843
Changes in operating assets and liabilities, net of non-cash transactions (400,533) (241,764) (48,666)
Net cash provided by operating activities of continuing operations 358,789 371,891 390,749
Cash Flows from Investing Activities of Continuing Operations:      
Capital expenditures (293,595) (244,651) (212,555)
Proceeds from sale of property and equipment 31,780 23,348 21,975
Proceeds from insurance settlements related to property and equipment 714 1,175 546
Cash paid for acquisitions, net of cash, cash equivalents and restricted cash acquired (94,917) (361,217) (68,788)
Investments in unconsolidated affiliates and other entities (36,909) (56,528) (13,150)
Cash received from investments in unconsolidated affiliates and other entities 4,705 65,789 7,593
Cash paid for intangible assets (14,448) 0 0
Net cash used in investing activities of continuing operations (402,670) (572,084) (264,379)
Cash Flows from Financing Activities of Continuing Operations:      
Borrowings under credit facility 4,491,782 2,932,338 2,744,453
Payments under credit facility (4,076,460) (2,624,404) (2,860,673)
Payments on other long-term debt (1,298) (5,361) (6,959)
Net borrowings (repayments) of short-term debt 33,790 (2,783) (1,957)
Debt issuance and amendment costs (1,976) (1,507) 0
Distributions to non-controlling interests, net of contributions received (4,038) (2,001) (761)
Payments related to tax withholding for share-based compensation (15,218) (18,543) (8,340)
Exercise of stock options 0 25 401
Repurchase of common stock (443,152) (50,000) 0
Net cash provided by (used in) financing activities of continuing operations (16,570) 227,764 (133,836)
Discontinued operations:      
Net cash used in operating activities 0 0 (1,035)
Net cash used in investing activities 0 0 (6,080)
Net cash used in discontinued operations 0 0 (7,115)
Effect of foreign exchange rate changes on cash, cash equivalents and restricted cash (68) 1,794 220
Net increase (decrease) in cash, cash equivalents and restricted cash (60,519) 29,365 (14,361)
Cash, cash equivalents and restricted cash, beginning of year 143,775 114,410 128,771
Cash, cash equivalents and restricted cash, end of year $ 83,256 $ 143,775 $ 114,410