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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Statement of Cash Flows [Abstract]    
Net (loss) income $ (8,621) $ 1,720
Adjustments to reconcile net (loss) income to net cash provided by operating activities:    
Depreciation and amortization 33,261 30,816
Share-based compensation 8,492 6,338
Unrealized foreign exchange loss, net 4,032 18,806
Deferred income taxes (2,374) (2,043)
Accretion of convertible debt discount and amortization of debt issuance costs 4,979 4,616
Changes in working capital, net of amounts acquired:    
Income taxes payable, net 5,534 (10,454)
Trade accounts receivable 148,697 300,063
Prepaid expenses and other current assets (29,551) (119,648)
Trade accounts payable 220,439 (126,242)
Deferred revenue 3,738 4,119
Accrued expenses and other current liabilities 11,234 14,811
Changes in noncurrent assets and liabilities 14,409 (17,018)
Net cash (used in) provided by operating activities (2,645) 105,884
Cash flows from investing activities:    
Acquisitions, net of cash acquired 475
Purchases of property and equipment (16,393) (30,392)
Purchases of other long-term assets (2,212) (2,046)
Other, net 380 357
Net cash used in investing activities (18,225) (31,606)
Cash flows from financing activities:    
Proceeds from issuance of shares 3,670 1,700
Repurchase of shares (808) (240,530)
Borrowings from revolving credit agreements 707,100 805,500
Repayments of revolving credit agreements (977,500) (805,500)
Net repayments from short-term debt obligations (32) (2,163)
Other, net (1,641) (1,651)
Net cash used in financing activities (269,211) (242,644)
Effect of exchange rate changes on cash and cash equivalents and restricted cash 53,188 (59,260)
Decrease in cash and cash equivalents and restricted cash (343,269) (227,626)
Cash and cash equivalents and restricted cash at beginning of period 2,099,508 1,817,379
Cash and cash equivalents and restricted cash at end of period 1,756,239 1,589,753
Supplemental disclosure of cash flow information:    
Interest paid during the period 2,703 3,678
Income taxes paid during the period $ 11,160 $ 16,064