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Consolidated Statements of Cash Flows - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Cash Flows from Operating Activities of Continuing Operations:      
Net income $ 318,225,000 $ 200,098,000 $ 321,824,000
Adjustments to reconcile net income to net cash provided by operating activities of continuing operations —      
(Income) loss from discontinued operations 0 342,000 (190,621,000)
Depreciation 183,808,000 170,240,000 162,845,000
Amortization of intangible assets 32,205,000 31,685,000 34,848,000
Asset impairment charges 58,057,000 7,964,000 58,451,000
Change in fair value of contingent consideration liabilities (5,171,000) 0 0
Equity in losses of unconsolidated affiliates 10,945,000 979,000 466,000
Amortization of debt issuance costs 1,321,000 1,356,000 1,251,000
Gain on sale of property and equipment (549,000) (734,000) (2,773,000)
Foreign currency loss 409,000 880,000 2,490,000
Provision for (recovery of) doubtful accounts 87,000 (543,000) 224,000
Deferred income tax benefit (32,130,000) (15,695,000) (19,403,000)
Non-cash stock-based compensation 46,448,000 42,843,000 36,939,000
Changes in operating assets and liabilities, net of non-cash transactions (241,180,000) (49,228,000) 222,108,000
Net cash provided by operating activities of continuing operations 372,475,000 390,187,000 628,649,000
Cash Flows from Investing Activities of Continuing Operations:      
Proceeds from sale of property and equipment 23,348,000 21,975,000 26,178,000
Additions of property and equipment (244,651,000) (212,555,000) (209,968,000)
Cash paid for acquisitions, net of cash acquired (361,217,000) (68,788,000) (112,914,000)
Investments in and return of equity from unconsolidated affiliates 8,986,000 (10,309,000) (6,074,000)
Cash received from (paid for) other investments, net 275,000 4,752,000 (4,338,000)
Cash withdrawn from (deposited to) restricted cash (2,566,000) (1,119,000) 214,000
Cash paid for intangible assets 0 0 (211,000)
Net cash used in investing activities of continuing operations (575,825,000) (266,044,000) (307,113,000)
Cash Flows from Financing Activities of Continuing Operations:      
Borrowings under credit facility 2,932,338,000 2,744,453,000 3,349,385,000
Payments under credit facility (2,624,404,000) (2,860,673,000) (2,935,752,000)
Payments on other long-term debt (5,361,000) (6,959,000) (2,683,000)
Borrowings of short-term debt 0 2,754,000 4,872,000
Payments on short-term debt (2,783,000) (4,711,000) (5,170,000)
Debt issuance and amendment costs (1,507,000) 0 (3,795,000)
Distributions to non-controlling interests, net of contributions received (2,001,000) (761,000) (18,915,000)
Payments related to tax withholding for share-based compensation (18,543,000) (8,340,000) (9,797,000)
Exercise of stock options 25,000 401,000 372,000
Repurchase of common stock, including accelerated stock repurchases (50,000,000) 0 (1,606,361,000)
Net cash provided by (used in) financing activities of continuing operations 227,764,000 (133,836,000) (1,227,844,000)
Discontinued operations:      
Net cash provided by (used in) operating activities 0 (1,035,000) 22,342,000
Net cash provided by (used in) investing activities 0 (6,080,000) 825,376,000
Net cash provided by (used in) discontinued operations 0 (7,115,000) 847,718,000
Effect of foreign exchange rate changes on cash and cash equivalents 1,688,000 220,000 (3,154,000)
Net increase (decrease) in cash and cash equivalents 26,102,000 (16,588,000) (61,744,000)
Cash and cash equivalents, beginning of year 112,183,000 128,771,000 190,515,000
Cash and cash equivalents, end of year $ 138,285,000 $ 112,183,000 $ 128,771,000