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Condensed Consolidating Information - Statements of Cash Flows (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Condensed Consolidating Statements of Cash Flows    
Net cash provided by operating activities $ 181,553 $ 177,935
Net cash used in investing activities (92,424) (90,377)
Accumulated other comprehensive loss (126,304) (131,222)
Decrease in cash, cash equivalents, and restricted cash (37,175) (43,664)
Cash, cash equivalents, and restricted cash at beginning of period 834,423 1,035,085
Cash, cash equivalents, and restricted cash at end of period 797,248 991,421
Parent    
Condensed Consolidating Statements of Cash Flows    
Net cash provided by operating activities 38,735 9,009
Net cash used in investing activities (71,294) (60,919)
Accumulated other comprehensive loss (22,190) 18,920
Decrease in cash, cash equivalents, and restricted cash (54,749) (32,990)
Cash, cash equivalents, and restricted cash at beginning of period 809,763 1,002,230
Cash, cash equivalents, and restricted cash at end of period 755,014 969,240
Guarantors    
Condensed Consolidating Statements of Cash Flows    
Net cash provided by operating activities 151,815 149,336
Net cash used in investing activities (16,183) (24,517)
Accumulated other comprehensive loss (123,429) (135,966)
Decrease in cash, cash equivalents, and restricted cash 12,203 (11,147)
Cash, cash equivalents, and restricted cash at beginning of period 14,368 20,740
Cash, cash equivalents, and restricted cash at end of period 26,571 9,593
Combined Non-Guarantors    
Condensed Consolidating Statements of Cash Flows    
Net cash provided by operating activities (4,520) 21,283
Net cash used in investing activities (365) (2,997)
Accumulated other comprehensive loss 10,256 (17,813)
Decrease in cash, cash equivalents, and restricted cash 5,371 473
Cash, cash equivalents, and restricted cash at beginning of period 10,292 12,115
Cash, cash equivalents, and restricted cash at end of period 15,663 12,588
Consolidating Adjustments    
Condensed Consolidating Statements of Cash Flows    
Net cash provided by operating activities (4,477) (1,693)
Net cash used in investing activities (4,582) (1,944)
Accumulated other comprehensive loss $ 9,059 $ 3,637