Shareholders' Equity (Details) - USD ($) $ / shares in Units, $ in Thousands			3 Months Ended
	Apr. 13, 2016	Feb. 25, 2016	Mar. 31, 2016
Distributions
Cash distribution to common shareholders (in dollars per share)		$ 0.43
Distribution payable to common shareholders (in dollars per share)	$ 0.43
Distribution paid to common shareholders	$ 30,584	$ 30,584
Cumulative Other Comprehensive Income (Loss)
Balance at the beginning of the period			$ (14,867)
Other comprehensive loss before reclassifications			17,416
Amounts reclassified from cumulative other comprehensive loss to net income			(1)
Net current period other comprehensive loss			17,415
Balance at the end of the period			2,548
Unrealized Loss on Investment in Available for Sale Securities
Cumulative Other Comprehensive Income (Loss)
Balance at the beginning of the period			(9,391)
Other comprehensive loss before reclassifications			12,871
Net current period other comprehensive loss			12,871
Balance at the end of the period			3,480
Equity in Unrealized Gain (Loss) of an Investee
Cumulative Other Comprehensive Income (Loss)
Balance at the beginning of the period			(5,476)
Other comprehensive loss before reclassifications			4,545
Amounts reclassified from cumulative other comprehensive loss to net income			(1)
Net current period other comprehensive loss			4,544
Balance at the end of the period			$ (932)