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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Net income $ 102,584 $ 69,980
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 54,407 52,265
Share-based compensation 10,493 8,579
Unrealized foreign exchange loss (gain), net (3,087) 18,755
Deferred income taxes 4,555 192
Gain (Loss) on Extinguishment of Debt 9,831  
Loss from unconsolidated affiliates 0 117
Accretion of convertible debt discount and amortization of debt issuance costs 9,685 6,994
Changes in working capital, net of amounts acquired:    
Income taxes payable, net 7,302 (729)
Trade accounts receivable (146,441) 35,456
Prepaid expenses and other current assets 25,606 12,304
Trade accounts payable (95,083) (99,237)
Deferred revenue 3,457 (84)
Accrued expenses and other current liabilities 85,262 (35,553)
Changes in noncurrent assets and liabilities (11,857) 265
Net cash provided by operating activities 56,714 69,304
Cash flows from investing activities:    
Acquisitions, net of cash acquired 0 (12,854)
Purchases of property and equipment (67,727) (53,381)
Purchases of other long-term assets (3,436) (3,717)
Other, net 2,403 962
Net cash used in investing activities (68,760) (68,990)
Cash flows from financing activities:    
Proceeds from issuance of shares 7,037 4,136
Repurchase of shares (2,448) (176,657)
Borrowings from revolving credit agreements 2,043,598 2,573,941
Repayments of revolving credit agreements (2,253,498) (2,333,885)
Proceeds from Convertible Debt 1,194,900 0
Repayments of long-term debt obligations (446,702) (6,199)
Borrowings from short-term debt obligations, net (14,184) 302,841
Payments of Debt Issuance Costs (19,673)  
Other, net (3,085) (3,255)
Net cash provided by financing activities 505,945 360,922
Effect of exchange rate changes on cash and cash equivalents and restricted cash 4,907 (25,471)
Increase in cash and cash equivalents and restricted cash 498,806 335,765
Cash and cash equivalents and restricted cash, period start 1,130,952 900,518
Cash and cash equivalents and restricted cash, period end 1,629,758 1,236,283
Interest paid during the period 7,107 9,857
Income taxes paid during the period $ 36,543 $ 31,710