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Condensed Consolidating Information - Statements of Cash Flows (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Condensed Consolidating Statements of Cash Flows    
Net cash provided by (used in) operating activities $ 177,935 $ 240,430
Net cash used in investing activities (90,377) (14,759)
Net cash provided by (used in) financing activities (131,222) (100,347)
Increase (decrease) in cash and equivalents (43,664) 125,324
Cash and equivalents at beginning of period 1,035,085 848,105
Cash and equivalents at end of period 991,421 973,429
Parent    
Condensed Consolidating Statements of Cash Flows    
Net cash provided by (used in) operating activities 9,009 102,209
Net cash used in investing activities (60,919) (19,409)
Net cash provided by (used in) financing activities 18,920 86,776
Increase (decrease) in cash and equivalents (32,990) 169,576
Cash and equivalents at beginning of period 1,002,230 767,594
Cash and equivalents at end of period 969,240 937,170
Guarantors    
Condensed Consolidating Statements of Cash Flows    
Net cash provided by (used in) operating activities 149,336 132,733
Net cash used in investing activities (24,517) (1,510)
Net cash provided by (used in) financing activities (135,966) (174,914)
Increase (decrease) in cash and equivalents (11,147) (43,691)
Cash and equivalents at beginning of period 20,740 54,859
Cash and equivalents at end of period 9,593 11,168
Combined Non-Guarantors    
Condensed Consolidating Statements of Cash Flows    
Net cash provided by (used in) operating activities 21,283 (877)
Net cash used in investing activities (2,997) (192)
Net cash provided by (used in) financing activities (17,813) 508
Increase (decrease) in cash and equivalents 473 (561)
Cash and equivalents at beginning of period 12,115 25,652
Cash and equivalents at end of period 12,588 25,091
Consolidating Adjustments    
Condensed Consolidating Statements of Cash Flows    
Net cash provided by (used in) operating activities (1,693) 6,365
Net cash used in investing activities (1,944) 6,352
Net cash provided by (used in) financing activities $ 3,637 $ (12,717)