Organization, Properties, Basis of Presentation, Financial Instruments and Recent Accounting Standards (Details 2) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Recently Issued Accounting Standards
Assets	$ (1,926,380)	$ (1,936,390)
Liabilities	(992,086)	(956,743)
Accounting Standards Update 2015-03: Simplifying the Presentation of Debt Issuance Costs | Pro Forma Adjustment
Recently Issued Accounting Standards
Assets	2,600	3,300
Liabilities	$ 2,600	$ 3,300