Sale of Building (Details) ft² in Thousands			1 Months Ended	12 Months Ended
	Dec. 23, 2015 USD ($)	Sep. 12, 2014 USD ($)	Mar. 31, 2015 USD ($)	Dec. 31, 2015 USD ($) ft²	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Property, Plant and Equipment [Line Items]
Gross proceeds from sale of building		$ 85,650,000
Fees within gross proceeds building sale		$ 150,000
Area of new club lease (in sq ft) | ft²				24
Proceeds from building financing arrangement	$ 3,500,000		$ 500		$ 83,400,000
Escrow from former tenant					1,750,000
Fees related to transaction					$ 3,160,000
Initial lease term (in years)					25 years
Gain on sale of building				$ 77,146,000	$ 0	$ 0
Building financing arrangement, net book value of building and building improvements	2,755,000
Building financing arrangement, net book value of land	986,000
Deferred building financing costs				3,005,000
Deferred lease receivable related to former tenant				$ 3,483,000
Building [Member]
Property, Plant and Equipment [Line Items]
Deferred building financing costs	$ 3,005,000