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) - $ / shares	12 Months Ended
	Dec. 31, 2015		Dec. 31, 2014		Dec. 31, 2013
2013 Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Beginning balance, Weighted average exercise price units	$ 29.13		$ 21.00
Weighted average exercise price units, Granted	36.71		32.66		$ 21.00
Weighted average exercise price units, Exercised	$ 28.37	[1]	$ 21.00	[1]
Weighted average exercise price units, Released from restriction		[2]		[2]
Weighted average exercise price units, Cancelled/Expired	$ 28.33	[3]	$ 21.00
Ending balance, Weighted average exercise price units	33.82		29.13		$ 21.00
Beginning balance, Weighted average fair value	4.10		3.50
Weighted average fair value, Granted	8.03		4.96		$ 3.50
Weighted average fair value, Exercised	$ 3.63	[1]	$ 3.52	[1]
Weighted average fair value, Released from restriction		[2]		[2]
Weighted average fair value, Cancelled/Expired	$ 3.52	[3]	$ 3.52		$ 3.52
Ending balance, Weighted average fair value	5.56		4.10		$ 3.50
Beginning balance, Weighted average exercise price options outstanding	22.87		21.00
Weighted average exercise price options outstanding, Granted	36.16		25.59		$ 21.00
Weighted average exercise price options outstanding, Exercised	$ 21.30	[1]	$ 21.00	[1]
Weighted average exercise price options outstanding, Released from restriction		[2]		[2]
Weighted average exercise price options outstanding, Cancelled/Expired	$ 21.00	[3]	$ 21.00
Ending balance, Weighted average exercise price options outstanding	$ 27.80		$ 22.87		$ 21.00
2013 Equity Incentive Plan [Member] | Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Beginning balance, Options Outstanding	584,949		367,910
Options, Granted	317,497		238,039		370,410
Options, Exercised	(23,157)	[1]	(3,000)	[1]
Options, Released from restriction		[2]		[2]
Options, Cancelled/Expired	(11,407)	[3]	(18,000)		(2,500)
Ending balance, Options Outstanding	867,882		584,949		367,910
2013 Equity Incentive Plan [Member] | Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Beginning balance, Number of units	246,785		108,629
Number of units, Granted	230,271		172,102		108,629
Number of units, Exercised	(54,400)	[1]	25,786	[1]
Number of units, Released from restriction		[2]		[2]
Number of units, Cancelled/Expired	(27,748)	[3]	(8,160)
Ending balance, Number of units	394,908		246,785		108,629
2010 Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Beginning balance, Weighted average fair value	$ 3.75		$ 3.84		$ 2.84
Weighted average fair value, Granted					$ 10.62
Weighted average fair value, Exercised	$ 4.18	[1]	$ 4.75	[1]
Weighted average fair value, Released from restriction		[2]		[2]
Weighted average fair value, Cancelled/Expired	$ 3.92	[3]	$ 5.23		$ 5.31
Ending balance, Weighted average fair value	$ 3.68		$ 3.75		$ 3.84
Restricted Class A Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Units surrendered	26,298
Class O Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Ending balance, Number of units	500,000
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	1,518,717		1,622,747		1,471,943
Number of units, Granted					224,244
Number of units, Exercised	(222,499)	[1]	(15,750)	[1]
Number of units, Released from restriction		[2]		[2]
Number of units, Cancelled/Expired	(3,319)	[3]	(88,280)		(73,440)
Ending balance, Number of units	1,292,899		1,518,717		1,622,747
Beginning balance, Weighted average exercise price units	$ 23.49		$ 23.44		$ 23.09
Weighted average exercise price units, Granted					$ 25.00
Weighted average exercise price units, Exercised	$ 22.02	[1]	$ 20.71	[1]
Weighted average exercise price units, Released from restriction		[2]		[2]
Weighted average exercise price units, Cancelled/Expired	$ 20.00	[3]	$ 23.01
Ending balance, Weighted average exercise price units	$ 23.76		$ 23.49		$ 23.44
Class RS Units [Member] | 2010 Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Beginning balance, Number of units	74,625		173,750		178,750
Number of units, Granted
Number of units, Exercised		[1]		[1]
Number of units, Released from restriction	(34,750)	[2]	(99,125)	[2]	(5,000)
Number of units, Cancelled/Expired		[3]
Ending balance, Number of units	39,875		74,625		173,750
Beginning balance, Weighted average exercise price units	$ 23.49		$ 24.31		$ 24.20
Weighted average exercise price units, Granted
Weighted average exercise price units, Exercised		[1]		[1]
Weighted average exercise price units, Released from restriction	$ 25.00	[2]	$ 24.94	[2]	$ 20.00
Weighted average exercise price units, Cancelled/Expired		[3]
Ending balance, Weighted average exercise price units	$ 22.18		$ 23.49		$ 24.31

[1] This represents the Class A common stock that has been released from restriction and which was not surrendered by the holder to satisfy their statutory minimum federal and state tax obligations associated with the vesting of restricted common stock.

[2] This represents Class RS units that upon vesting have converted to Operating Partnership units.

[3] Includes 26,298 of restricted Class A common stock surrendered by certain employees to satisfy their statutory minimum federal and state tax obligations associated with the vesting of restricted common stock.