Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Current income tax expense (benefit)									$ 3,809	$ 3,156
Excise tax expense									0	339
Income Tax Contingency [Line Items]
Income tax provision (benefit)	$ 2,215	$ (1,155)	$ 2,115	$ 312	$ 917	$ 2,239	$ 0	$ 0	3,487	3,156	$ 0
Net capital loss carry-forward	4,158				1,981				4,158	1,981
Net operating loss available for carry-back and carry-forward	9,604				0				9,604	0
Deferred Tax Assets, Valuation Allowance	15,303				6,485				15,303	6,485
Net deferred tax liability	85				$ 0				85	0
Tax Year 2015 [Member]
Income Tax Contingency [Line Items]
Income tax provision (benefit)										$ 2,000
State and Local Jurisdiction [Member]
Income Tax Contingency [Line Items]
Net operating loss available for carry-back and carry-forward	8,800								8,800
Domestic Tax Authority [Member]
Income Tax Contingency [Line Items]
Net deferred tax liability	85								85
Taxable REIT Subsidiary [Member]
Income Tax Contingency [Line Items]
Net capital loss carry-forward	6,100								6,100
Taxable REIT Subsidiary [Member] | State and Local Jurisdiction [Member]
Income Tax Contingency [Line Items]
Net operating loss available for carry-back and carry-forward	765								765
Operating Loss Carryforwards [Member]
Income Tax Contingency [Line Items]
Deferred Tax Assets, Valuation Allowance	$ 9,200								$ 9,200