Share and Unit-Based Plans - LTIP Activity (Details) - LTIP units - $ / shares				12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Mar. 07, 2014	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Units
Balance at beginning of year (shares)				56,315	46,695	0
Granted (shares)				480,371	424,442	725,908
Vested (shares)	(55,934)	(136,465)		(214,114)	(414,822)	(679,213)
Forfeited (shares)				0	0	0
Balance at end of year (shares)	56,315	46,695		322,572	56,315	46,695
Weighted Average Grant Date Fair Value
Balance at beginning of year (in dollars per share)				$ 73.24	$ 58.89	$ 0.00
Granted (in dollars per share)			$ 60.25	65.00	74.71	51.71
Vested (in dollars per share)				77.45	73.13	51.22
Forfeited (in dollars per share)				0.00	0.00	0.00
Balance at end of year (in dollars per share)	$ 73.24	$ 58.89		$ 58.18	$ 73.24	$ 58.89