Related-Party Transactions (Dividends Received On Common Shares Reported As Net Investment Income) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Dividends From Parent's Shares [Member]
Related Party Transaction [Line Items]
Dividends received		$ 9,234		$ 27,702
Dividends From Preferred Shares Of Affiliate [Member]
Related Party Transaction [Line Items]
Dividends received	$ 7,758		$ 23,274