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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Cash Flows from Operating Activities of Continuing Operations:        
Net income $ 64,360 $ 16,729 $ 112,800 $ 37,588
Adjustments to reconcile net income to net cash provided by (used in) operating activities of continuing operations—        
Depreciation 44,650 42,759 87,343 83,929
Amortization of intangible assets 6,494 8,141 13,056 15,636
Equity in (earnings) losses of unconsolidated affiliates 2,148 378 2,751 559
Amortization of debt issuance costs 338 338 678 678
(Gain) loss on sale of property and equipment (2,007) 654 (166) 547
Foreign currency loss 641 558 862 668
Provision for (recovery of) doubtful accounts 61 56 926 (927)
Deferred income tax provision (benefit) 3,666 (7,858) 3,630 (5,142)
Non-cash stock-based compensation 11,557 9,503 23,423 23,222
Changes in operating assets and liabilities, net of non-cash transactions (126,963) (3,448) (244,169) 116,863
Net cash provided by operating activities of continuing operations 4,945 67,810 1,134 273,621
Cash Flows from Investing Activities of Continuing Operations:        
Proceeds from sale of property and equipment 7,543 5,165 12,344 10,254
Additions of property and equipment (58,257) (60,855) (105,281) (108,550)
Cash paid for acquisitions, net of cash acquired (6,108) (35) (7,635) (39,710)
Investments in and return of equity from unconsolidated affiliates (9,229) (3,163) (12,954) (5,388)
Cash received from (paid for) other investments, net 615 503 (1,086) 1,080
Cash withdrawn from (deposited to) restricted cash (2,031) 42 (119) 42
Net cash used in investing activities of continuing operations (67,467) (58,343) (114,731) (142,272)
Cash Flows from Financing Activities of Continuing Operations:        
Borrowings under credit facility 550,883 696,572 1,248,094 1,350,988
Payments under credit facility (491,943) (696,668) (1,123,384) (1,426,271)
Payments on other long-term debt (1,354) (692) (2,883) (5,547)
Payments on short-term debt 0 0 (2,783) (4,711)
Distributions to non-controlling interests (383) 0 (1,363) 0
Payments related to tax withholding for share-based compensation (1,613) (1,160) (17,805) (7,232)
Exercise of stock options 0 163 25 214
Net cash provided by (used in) financing activities of continuing operations 55,590 (1,785) 99,901 (92,559)
Discontinued operations:        
Net cash used in investing activities 0 (437) 0 (6,080)
Net cash used in discontinued operations 0 (437) 0 (6,080)
Effect of foreign exchange rate changes on cash and cash equivalents (17) (216) 1,078 863
Net increase (decrease) in cash and cash equivalents (6,949) 7,029 (12,618) 33,573
Cash and cash equivalents, beginning of period 106,514 155,315 112,183 128,771
Cash and cash equivalents, end of period $ 99,565 $ 162,344 $ 99,565 $ 162,344