Income Taxes and Distributions (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Textuals [Line Items]
Percentage of taxable income to be distributed to stockholders for federal tax purposes	90.00%
Percentage of federal excise tax on real estate investment trusts that do not distribute income.	4.00%
Income tax provision	$ 8,674,000	$ 20,128,000	$ (19,128,000)
Cumulative loss period	3 years
Tax valuation allowance	$ 155,592,000
Built-in gains tax recognition period	5 years
NOL carryforwards	$ 348,031,000
International [Member]
Income Tax Textuals [Line Items]
Income tax provision	9,804,000,000	4,806,000,000	$ (3,315,000,000)
Canada
Income Tax Textuals [Line Items]
NOL carryforwards	154,029,000,000	134,552,000,000
United Kingdom
Income Tax Textuals [Line Items]
NOL carryforwards	$ 242,377,000,000	$ 183,712,000,000