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Combined Guarantor Subsidiaries - Combined Statements of Owners' Equity - Summary (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2018
Mar. 31, 2018
Jun. 30, 2019
Jun. 30, 2018
Increase (Decrease) in Partners' Capital [Roll Forward]            
Net loss $ (29,688)   $ (29,976)   $ (76,497) $ (30,637)
Guarantor Subsidiaries            
Increase (Decrease) in Partners' Capital [Roll Forward]            
Beginning balance 1,433,602 $ 1,404,623 1,509,846 $ 1,486,164 1,404,623 1,486,164
Net loss 22,775 62,109 27,117 29,615 84,884 56,732
Contributions 16,558 17,363 14,677 50,514    
Distributions (54,312) (41,658) (52,411) (56,447)    
Noncash distributions (2,620) (8,835)        
Ending balance $ 1,416,003 $ 1,433,602 $ 1,499,229 $ 1,509,846 $ 1,416,003 $ 1,499,229