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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Cash Flows from Operating Activities of Continuing Operations:      
Net income $ 200,098 $ 321,824 $ 315,082
Adjustments to reconcile net income to net cash provided by operating activities of continuing operations -      
(Income) loss from discontinued operations 342 (190,621) (27,490)
Depreciation 170,240 162,845 141,106
Amortization of intangible assets 31,685 34,848 34,257
Asset impairment charges 7,964 58,451  
Equity in losses of unconsolidated affiliates 979 466 332
Amortization of debt issuance costs 1,356 1,251 1,094
Gain on sale of property and equipment (734) (2,773) (1,803)
Foreign currency loss 880 2,490 1,244
Provision for (recovery of) doubtful accounts (543) 224 1,411
Provision for contract receivable     102,460
Non-cash portion of arbitration expense     10,518
Deferred income tax provision (benefit) (15,695) (19,403) 22,906
Non-cash stock-based compensation 42,843 36,939 37,449
Tax impact of stock-based equity awards (671) (669) (1,563)
Changes in operating assets and liabilities, net of non-cash transactions (57,568) 212,311 (389,261)
Net cash provided by operating activities of continuing operations 381,176 618,183 247,742
Cash Flows from Investing Activities of Continuing Operations:      
Proceeds from sale of property and equipment 21,975 26,178 14,448
Additions of property and equipment (212,555) (209,968) (247,216)
Cash paid for acquisitions, net of cash acquired (68,788) (112,914) (262,218)
Investments in and return of equity from unconsolidated affiliates (10,309) (6,074) (3,127)
Cash received from (paid for) other investments, net 4,752 (4,338) 6,214
Cash withdrawn from (deposited to) restricted cash (1,119) 214 3,565
Cash paid for intangible assets   (211) (252)
Net cash used in investing activities of continuing operations (266,044) (307,113) (488,586)
Cash Flows from Financing Activities of Continuing Operations:      
Borrowings under credit facility 2,744,453 3,349,385 938,047
Payments under credit facility (2,860,673) (2,935,752) (866,224)
Borrowings of other long-term debt     394
Payments on other long-term debt (6,959) (2,683) (30,448)
Borrowings of short-term debt 2,754 4,872 5,056
Payments on short-term debt (4,711) (5,170)  
Debt issuance and amendment costs   (3,795)  
Contributions from non-controlling interests   2,313  
Distributions to non-controlling interests (761) (21,228) (14,432)
Tax impact of stock-based equity awards 671 669 1,563
Exercise of stock options 401 372 1,179
Repurchase of common stock, including accelerated stock repurchases   (1,606,361) (93,482)
Net cash used in financing activities of continuing operations (124,825) (1,217,378) (58,347)
Discontinued operations:      
Net cash provided by (used in) operating activities (1,035) 22,342 63,082
Net cash provided by provided by (used in) investing activities (6,080) 825,376 (54,280)
Net cash provided by (used in) discontinued operations (7,115) 847,718 8,802
Effect of foreign exchange rate changes on cash and cash equivalents 220 (3,154) (7,873)
Net decrease in cash and cash equivalents (16,588) (61,744) (298,262)
Cash and cash equivalents, beginning of year 128,771 190,515 488,777
Cash and cash equivalents, end of year $ 112,183 $ 128,771 $ 190,515