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Condensed Consolidating Information - Statements of Cash Flows (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Condensed Consolidating Statements of Cash Flows      
Net cash provided by (used in) operating activities $ 1,415,469 $ 739,420 $ 852,760
Net cash used in investing activities (895,264) (139,105) (312,893)
Net cash provided by (used in) financing activities (720,867) (413,335) (425,425)
Increase (decrease) in cash and equivalents, and restricted cash (200,662) 186,980 114,442
Cash and equivalents, and restricted cash at beginning of period 1,035,085 848,105 733,663
Cash and equivalents, and restricted cash at end of period 834,423 1,035,085 848,105
Consolidating Adjustments      
Condensed Consolidating Statements of Cash Flows      
Net cash provided by (used in) operating activities 11,029 5,746 2,797
Net cash used in investing activities (600) 4,751 (2,245)
Net cash provided by (used in) financing activities (10,429) (10,497) (552)
Parent Company [Member]      
Condensed Consolidating Statements of Cash Flows      
Net cash provided by (used in) operating activities 577,735 171,216 326,256
Net cash used in investing activities (756,347) (62,534) (161,043)
Net cash provided by (used in) financing activities (13,855) 125,954 (35,365)
Increase (decrease) in cash and equivalents, and restricted cash (192,467) 234,636 129,848
Cash and equivalents, and restricted cash at beginning of period 1,002,230 767,594 637,746
Cash and equivalents, and restricted cash at end of period 809,763 1,002,230 767,594
Guarantors      
Condensed Consolidating Statements of Cash Flows      
Net cash provided by (used in) operating activities 833,409 594,404 517,643
Net cash used in investing activities (133,220) (73,021) (140,027)
Net cash provided by (used in) financing activities (706,569) (555,494) (404,971)
Increase (decrease) in cash and equivalents, and restricted cash (6,380) (34,111) (27,355)
Cash and equivalents, and restricted cash at beginning of period 20,748 54,859 82,214
Cash and equivalents, and restricted cash at end of period 14,368 20,748 54,859
Combined Non-Guarantors      
Condensed Consolidating Statements of Cash Flows      
Net cash provided by (used in) operating activities (6,704) (31,946) 6,064
Net cash used in investing activities (5,097) (8,301) (9,578)
Net cash provided by (used in) financing activities 9,986 26,702 15,463
Increase (decrease) in cash and equivalents, and restricted cash (1,815) (13,545) 11,949
Cash and equivalents, and restricted cash at beginning of period 12,107 25,652 13,703
Cash and equivalents, and restricted cash at end of period $ 10,292 $ 12,107 $ 25,652