Income Taxes and Distributions (Details Textuals) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Textuals [Line Items]
Income tax provision	$ 20,128	$ (19,128)	$ 6,451
NOL Carryforwards	$ 448,475
Operating Loss Carryforwards Limitations On Use	Beginning with tax years after December 31, 2017, the Tax Cuts and Jobs Act (“Tax Act”) eliminates the carryback period, limits the NOLs to 80% of taxable income and replaces the 20-year carryforward period with an indefinite carryforward period.
Carryforwards expiration date	Dec. 31, 2036
Tax Valuation Allowance	$ 127,283
Percentage of taxable income to be distributed to stockholders for federal tax purposes	90.00%
Percentage of net capital gains on taxable income distributed to stockholders	100.00%
Percentage of federal excise tax on real estate investment trusts that do not distribute income	4.00%
International [Member]
Income Tax Textuals [Line Items]
Income tax provision	$ 4,806	(3,315)	$ 7,385
Canada [Member]
Income Tax Textuals [Line Items]
NOL Carryforwards	$ 134,552	$ 104,988
Operating Loss Carryforwards Limitations On Use	These Canadian losses have a 20-year carryforward period	These Canadian losses have a 20-year carryforward period
United Kingdom
Income Tax Textuals [Line Items]
NOL Carryforwards	$ 183,712	$ 158,156
Operating Loss Carryforwards Limitations On Use	These U.K. losses do not have a finite carryforward period.	These U.K. losses do not have a finite carryforward period.