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Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
Segment Information (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 233,799	$ 238,502	$ 249,801	$ 208,888	$ 223,627	$ 229,217	$ 229,934	$ 190,084	$ 930,990	$ 872,862	$ 799,688
Net Assets	2,882,029				2,763,990				2,882,029	2,763,990	2,563,841
Chicago
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									128,952	132,690	149,498
Net Assets	449,742				436,490				449,742	436,490	462,938
Los Angeles
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									0	64,923	58,608
Net Assets	0				0				0	0	99,258
Boston
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									130,791	116,861	102,482
Net Assets	394,502				397,807				394,502	397,807	399,162
US Virgin Islands
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									64,383	65,586	62,439
Net Assets	116,618				118,458				116,618	118,458	120,222
New York
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									150,567	134,841	95,798
Net Assets	644,243				660,609				644,243	660,609	516,555
Minneapolis
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									54,247	49,704	50,097
Net Assets	124,339				131,080				124,339	131,080	136,255
Denver
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									36,516	34,206	31,909
Net Assets	111,221				113,670				111,221	113,670	115,447
Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									365,534	274,051	248,857
Net Assets	$ 1,041,364				$ 905,876				$ 1,041,364	$ 905,876	$ 714,004