Derivatives (Interest Rate Swap) (Details) - Interest Rate Swap - Fixed [Member] - Cash Flow Hedging [Member] - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Apr. 01, 2015
Derivative [Line Items]
Effective portion of derivative gain (loss) recognized in other comprehensive income (loss)	$ (1,603)	$ (11)	$ (4,822)	$ (11)
Interest Expense [Member]
Derivative [Line Items]
Cash flow hedge loss to be reclassified within 12 months			(2,400)
Effective portion of derivative gain (loss) reclassified from accumulated other comprehensive loss into income	$ (620)	$ 0	$ (1,011)	$ 0
Senior Loans [Member]
Derivative [Line Items]
Derivative, Notional Amount					$ 220,000
Derivative, Fixed Interest Rate					4.85%