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Capital - Earnings Per Unit (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Numerator:        
Net income $ 30,184 $ 31,359 $ 48,242 $ 50,504
Private perpetual preferred unit distributions (234) (234) (468) (468)
Earnings allocated to unvested units (212) (200) (374) (354)
Net income attributable to common unitholders - basic and diluted $ 29,738 $ 30,925 $ 47,400 $ 49,682
Denominator:        
Weighted average units outstanding - basic (in units) 297,244,000 296,388,000 297,028,000 296,388,000
Effect of dilutive securities:        
Effect of dilutive securities - stock-based compensation plans (in units) 0 973,000 1,000 874,000
Effect of dilutive securities - exchangeable senior notes (in units) 0 1,037,000 0 918,000
Weighted average units outstanding - diluted (in units) 297,244,000 298,398,000 297,029,000 298,180,000
Earnings per share:        
Basic earnings (in USD per unit) $ 0.10 $ 0.10 $ 0.16 $ 0.17
Diluted earnings (in USD per unit) $ 0.10 $ 0.10 $ 0.16 $ 0.17
Antidilutive securities (in units) 414,801 909,591 417,074 766,078