Other Current Liabilities and Other Liabilities (Details) (USD $)	3 Months Ended				6 Months Ended			1 Months Ended
	Jun. 30, 2014	Mar. 31, 2014	Jun. 30, 2013	Mar. 31, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013	May 31, 2014 Rochester Portfolio	Jan. 31, 2013 Rochester Portfolio	Jun. 30, 2014 Rochester Portfolio
Other Current Liabilities
Property, sales and use taxes payable	$ 16,701,000				$ 16,701,000		$ 14,482,000
Income tax payable	204,000				204,000
Accrued interest	4,101,000				4,101,000		3,078,000
Advance deposits	12,512,000				12,512,000		8,259,000
Management fees payable	1,070,000				1,070,000		1,077,000
Other	3,585,000				3,585,000		3,392,000
Other Current Liabilities	38,173,000				38,173,000		30,288,000
Income tax provision	(110,000)	(200,000)	(129,000)		(334,000)	(6,286,000)
Other Liabilities
Deferred gain on sale of asset	7,000,000				7,000,000		14,000,000		3,700,000	7,000,000
Interest rate swap derivative agreement	818,000				818,000		1,066,000
Accrued income tax	1,515,000				1,515,000		1,491,000
Deferred revenue	6,642,000				6,642,000		6,918,000
Deferred rent	13,667,000				13,667,000		12,270,000
Deferred incentive management fees	2,045,000				2,045,000		1,714,000
Other	2,419,000				2,419,000		2,499,000
Other Liabilities	34,106,000				34,106,000		39,958,000
Other Current Liabilities and Other Liabilities
Portfolio's pension plan liability									14,000,000	7,000,000
Reduction in pension plan liability								7,000,000
Gain (loss) on sale	5,199,000				5,199,000	51,620,000		7,000,000	51,600,000
Unrecognized Tax Benefits, Period Increase (Decrease)				1,500,000
Accrued interest on unrecognized tax benefit	$ 12,000	$ 12,000			$ 12,000