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)	3 Months Ended
	Mar. 31, 2017 $ / shares shares
2013 Equity Incentive Plan [Member] | Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Beginning balance, Options Outstanding (in shares) | shares	1,058,297
Options, Granted (in shares) | shares	468,875
Options, Exercised (in shares) | shares	(1,250)
Options, Cancelled/Expired (in shares) | shares	(1,500)
Ending balance, Options Outstanding (in shares) | shares	1,524,422
Beginning balance, Weighted average exercise price options outstanding	$ 31.72
Weighted average exercise price options outstanding, Granted	50.66
Weighted average exercise price options outstanding, Exercised	25.51
Weighted average exercise price options outstanding, Cancelled/Expired	37.69
Ending balance, Weighted average exercise price options outstanding	37.54
Beginning balance, weighted average fair value, options	6.51
Weighted average fair value, granted, options	10.32
Weighted average fair value, vested, options	4.93
Weighted average fair value, cancelled/expired, options	8.77
Ending balance, weighted average fair value, options	$ 7.68
2013 Equity Incentive Plan [Member] | Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Beginning balance, Options Outstanding (in shares) | shares	414,691
Options, Granted (in shares) | shares	227,127
Options, Exercised (in shares) | shares	(85,624)
Options, Cancelled/Expired (in shares) | shares	(34,887)
Ending balance, Options Outstanding (in shares) | shares	521,307
Beginning balance, weighted average fair value, options	$ 40.67
Weighted average fair value, granted, options	50.66
Weighted average fair value, vested, options	43.36
Weighted average fair value, cancelled/expired, options	42.44
Ending balance, weighted average fair value, options	$ 44.46
Class O Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Ending balance, Number of units (in shares) | shares	100,000
Class O Units [Member] | 2010 Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Beginning balance, Number of units (in shares) | shares	1,134,811
Number of units, Exercised | shares	(26,650)
Ending balance, Number of units (in shares) | shares	1,108,161
Beginning balance, Weighted average exercise price units	$ 24.06
Weighted average exercise price units, Exercised	20.00
Ending balance, Weighted average exercise price units	24.16
Beginning balance, Weighted average fair value	3.62
Weighted average fair value, Exercised	3.92
Ending balance, Weighted average fair value	$ 3.61