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Partners' Capital, Equity and Incentive Compensation Plans (Summary of Award Activity Under 2010 Equity Incentive Plan and 2013 Equity Incentive Plan and Related Information) (Details)
9 Months Ended
Sep. 30, 2018
$ / shares
shares
2013 Equity Incentive Plan | Options  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Beginning balance, Options Outstanding (in shares) | shares 1,369,270
Options, Granted (in shares) | shares 672,549
Options, Exercised (in shares) | shares (1,188)
Ending balance, Options Outstanding (in shares) | shares 2,040,631
Beginning balance, Weighted average exercise price options outstanding $ 38.18
Weighted average exercise price options outstanding, Granted 34.03
Weighted average exercise price options outstanding, Exercised 23.61
Ending balance, Weighted average exercise price options outstanding 36.82
Beginning balance, weighted average fair value, options 7.80
Weighted average fair value, granted, options 5.63
Weighted average fair value, vested, options 4.34
Ending balance, weighted average fair value, options $ 7.08
2013 Equity Incentive Plan | Restricted Stock  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Beginning balance, Options Outstanding (in shares) | shares 381,864
Options, Granted (in shares) | shares 346,757
Options, Exercised (in shares) | shares (176,507)
Options, Cancelled/Expired (in shares) | shares (59,344)
Ending balance, Options Outstanding (in shares) | shares 492,770
Beginning balance, weighted average fair value, options $ 46.37
Weighted average fair value, granted, options 35.60
Weighted average fair value, vested, options 47.41
Weighted average fair value, cancelled/expired, options 45.31
Ending balance, weighted average fair value, options $ 38.54
Class O Units | 2010 Equity Incentive Plan  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Beginning balance, Number of units (in shares) | shares 568,040
Number of units, Exercised | shares (465,761)
Ending balance, Number of units (in shares) | shares 102,279
Beginning balance, Weighted average exercise price units $ 23.52
Weighted average exercise price units, Exercised 23.40
Ending balance, Weighted average exercise price units 24.02
Beginning balance, Weighted average fair value 5.00
Weighted average fair value, Exercised 4.76
Ending balance, Weighted average fair value $ 5.67