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Condensed Consolidating Financial Statements (Cash Flow) (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Cash flows from operating activities:    
Net cash provided by operating activities $ 278,577 $ 165,977
Cash flows from investing activities:    
Capital expenditures (37,402) (39,936)
Return of capital from investees 347 0
Investment in and loans to investees (87,488) (43,000)
Payments for acquisition of a business, net of cash acquired (34,879) 0
Increase to investment in affiliates 0 0
Net cash used in investing activities (159,422) (82,936)
Cash flows from financing activities:    
Principal payments on long-term debt 0 (110,965)
Deemed repurchases of restricted stock units (15,734) (13,373)
Purchase of treasury stock (242,409) (244,374)
Proceeds from stock option exercises 4,317 0
Principal payments on capital lease obligations (2,625) (2,526)
Distributions to noncontrolling interests (6,967) (12,930)
Net cash used in financing activities (263,418) (384,168)
Net decrease in cash and cash equivalents from operations (144,263) (301,127)
Effect of exchange rate changes on cash and cash equivalents 1,604 9,217
Cash and cash equivalents at end of period 416,124 189,479
Consolidation, Eliminations [Member]    
Cash flows from operating activities:    
Net cash provided by operating activities (433,038) (429,621)
Cash flows from investing activities:    
Capital expenditures 0 0
Return of capital from investees 0  
Investment in and loans to investees 0 0
Payments for acquisition of a business, net of cash acquired 0  
Increase to investment in affiliates 701,129 (14,706)
Net cash used in investing activities 701,129 (14,706)
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
Proceeds from stock option exercises 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 268,091 (444,327)
Effect of exchange rate changes on cash and cash equivalents (268,091) 444,327
Cash and cash equivalents at end of period 0 0
Parent Company [Member]    
Cash flows from operating activities:    
Net cash provided by operating activities 296,928 258,037
Cash flows from investing activities:    
Capital expenditures 0 0
Return of capital from investees 0  
Investment in and loans to investees 0 0
Payments for acquisition of a business, net of cash acquired 0  
Increase to investment in affiliates (46,945) 102,285
Net cash used in investing activities (46,945) 102,285
Cash flows from financing activities:    
Principal payments on long-term debt   (111,000)
Deemed repurchases of restricted stock units (15,734) (13,373)
Purchase of treasury stock (242,409) (244,374)
Proceeds from stock option exercises 4,317  
Principal payments on capital lease obligations 0 0
Distributions to noncontrolling interests 0 0
Net cash used in financing activities (253,826) (368,747)
Net decrease in cash and cash equivalents from operations (3,843) (8,425)
Effect of exchange rate changes on cash and cash equivalents 6,408 7,976
Cash and cash equivalents at end of period 2,885 116
Guarantor Subsidiaries [Member]    
Cash flows from operating activities:    
Net cash provided by operating activities 852,314 322,282
Cash flows from investing activities:    
Capital expenditures (32,827) (27,480)
Return of capital from investees 0  
Investment in and loans to investees 0 0
Payments for acquisition of a business, net of cash acquired 0  
Increase to investment in affiliates (1,550,189) (127,727)
Net cash used in investing activities (1,583,016) (155,207)
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
Proceeds from stock option exercises 0  
Principal payments on capital lease obligations (1,464) (1,330)
Distributions to noncontrolling interests 0 0
Net cash used in financing activities (1,464) (1,330)
Net decrease in cash and cash equivalents from operations (732,166) 165,745
Effect of exchange rate changes on cash and cash equivalents 584,331 (444,327)
Cash and cash equivalents at end of period 243,413 42,368
Non-Guarantor Subsidiaries [Member]    
Cash flows from operating activities:    
Net cash provided by operating activities (437,627) 15,279
Cash flows from investing activities:    
Capital expenditures (4,575) (12,456)
Return of capital from investees 347  
Investment in and loans to investees (87,488) (43,000)
Payments for acquisition of a business, net of cash acquired (34,879)  
Increase to investment in affiliates 896,005 40,148
Net cash used in investing activities 769,410 (15,308)
Cash flows from financing activities:    
Principal payments on long-term debt   35
Deemed repurchases of restricted stock units 0 0
Purchase of treasury stock 0 0
Proceeds from stock option exercises 0  
Principal payments on capital lease obligations (1,161) (1,196)
Distributions to noncontrolling interests (6,967) (12,930)
Net cash used in financing activities (8,128) (14,091)
Net decrease in cash and cash equivalents from operations 323,655 (14,120)
Effect of exchange rate changes on cash and cash equivalents (321,044) 1,241
Cash and cash equivalents at end of period $ 169,826 $ 146,995