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Condensed Consolidating Financial Statements (Cash Flow) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Cash flows from operating activities:    
Net cash provided by operating activities $ 116,972 $ 144,870
Cash flows from investing activities:    
Capital expenditures (11,942) (20,206)
Return of capital from investees 172 0
Investment in and loans to investees (42,318) (28,000)
Increase to investment in affiliates 0 0
Net cash used in investing activities (54,088) (48,206)
Cash flows from financing activities:    
Principal payments on long-term debt 0 (55,500)
Deemed repurchases of restricted stock units (15,354) (12,796)
Purchase of treasury stock (83,637) (91,423)
Principal payments on capital lease obligations (1,406) (1,401)
Distributions to noncontrolling interests (1,435) (11,712)
Net cash used in financing activities (101,832) (172,832)
Net decrease in cash and cash equivalents from operations (38,948) (76,168)
Effect of exchange rate changes on cash and cash equivalents 9,365 (1,573)
Cash and cash equivalents at end of period 529,200 403,648
Consolidation, Eliminations [Member]    
Cash flows from operating activities:    
Net cash provided by operating activities (264,998) (239,207)
Cash flows from investing activities:    
Capital expenditures 0 0
Return of capital from investees 0  
Investment in and loans to investees 0 0
Increase to investment in affiliates 203,739 94,908
Net cash used in investing activities 203,739 94,908
Cash flows from financing activities:    
Principal payments on long-term debt   0
Deemed repurchases of restricted stock units 0 0
Purchase of treasury stock 0 0
Principal payments on capital lease obligations 0 0
Distributions to noncontrolling interests 0 0
Net cash used in financing activities 0 0
Net decrease in cash and cash equivalents from operations (61,259) (144,299)
Effect of exchange rate changes on cash and cash equivalents 61,259 144,299
Cash and cash equivalents at end of period 0 0
Parent Company [Member]    
Cash flows from operating activities:    
Net cash provided by operating activities 234,947 224,091
Cash flows from investing activities:    
Capital expenditures 0 0
Return of capital from investees 0  
Investment in and loans to investees 0 0
Increase to investment in affiliates (141,109) (57,926)
Net cash used in investing activities (141,109) (57,926)
Cash flows from financing activities:    
Principal payments on long-term debt   (55,500)
Deemed repurchases of restricted stock units (15,354) (12,796)
Purchase of treasury stock (83,637) (91,423)
Principal payments on capital lease obligations 0 0
Distributions to noncontrolling interests 0 0
Net cash used in financing activities (98,991) (159,719)
Net decrease in cash and cash equivalents from operations (5,153) 6,446
Effect of exchange rate changes on cash and cash equivalents 5,017 (6,488)
Cash and cash equivalents at end of period 184 523
Guarantor Subsidiaries [Member]    
Cash flows from operating activities:    
Net cash provided by operating activities 154,495 138,889
Cash flows from investing activities:    
Capital expenditures (11,040) (15,645)
Return of capital from investees 0  
Investment in and loans to investees 0 0
Increase to investment in affiliates (129,821) (36,982)
Net cash used in investing activities (140,861) (52,627)
Cash flows from financing activities:    
Principal payments on long-term debt   0
Deemed repurchases of restricted stock units 0 0
Purchase of treasury stock 0 0
Principal payments on capital lease obligations (723) (657)
Distributions to noncontrolling interests 0 0
Net cash used in financing activities (723) (657)
Net decrease in cash and cash equivalents from operations 12,911 85,605
Effect of exchange rate changes on cash and cash equivalents (49,740) (144,299)
Cash and cash equivalents at end of period 354,419 262,256
Non-Guarantor Subsidiaries [Member]    
Cash flows from operating activities:    
Net cash provided by operating activities (7,472) 21,097
Cash flows from investing activities:    
Capital expenditures (902) (4,561)
Return of capital from investees 172  
Investment in and loans to investees (42,318) (28,000)
Increase to investment in affiliates 67,191 0
Net cash used in investing activities 24,143 (32,561)
Cash flows from financing activities:    
Principal payments on long-term debt   0
Deemed repurchases of restricted stock units 0 0
Purchase of treasury stock 0 0
Principal payments on capital lease obligations (683) (744)
Distributions to noncontrolling interests (1,435) (11,712)
Net cash used in financing activities (2,118) (12,456)
Net decrease in cash and cash equivalents from operations 14,553 (23,920)
Effect of exchange rate changes on cash and cash equivalents (7,171) 4,915
Cash and cash equivalents at end of period $ 174,597 $ 140,869