Derivatives (Interest Rate Swap) (Details) - Interest Rate Swap - Fixed [Member] - Cash Flow Hedging [Member] - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Apr. 01, 2015
Derivative [Line Items]
Effective portion of derivative gain (loss) recognized in other comprehensive income (loss)	$ 6	$ (3,211)	$ (4,816)	$ (3,222)
Interest Expense [Member]
Derivative [Line Items]
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months			(2,300)
Effective portion of derivative gain (loss) reclassified from accumulated other comprehensive loss into income	$ (767)	$ 0	$ (1,778)	$ 0
Senior Loans [Member]
Derivative [Line Items]
Derivative, Notional Amount					$ 220,000
Derivative, Fixed Interest Rate					4.85%