Derivatives (Interest Rate Swap) (Details) - Interest Rate Swap [Member] - Cash Flow Hedging [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Derivative [Line Items]
Effective portion of derivative gain (loss) recognized in other comprehensive income (loss)	$ 204	$ (3,219)
Interest Expense [Member]
Derivative [Line Items]
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months	(1,400)
Effective portion of derivative gain (loss) reclassified from accumulated other comprehensive loss into income (loss)	(585)	$ (391)
Senior Loans [Member]
Derivative [Line Items]
Derivative, Notional Amount	$ 220,000
Derivative, Fixed Interest Rate	4.85%