Derivatives (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Derivative [Line Items]
Fair value of collateral pledged to secure interest rate contracts			$ 2,000
Incremental interest expense paid to interest rate swap counterparties	$ 743	$ 826
2011 Interest Rate Swap
Derivative [Line Items]
Notional amount of interest rate derivatives	$ 93,500
Fixed rate payments, interest rate	5.50%		5.50%
Variable rate payment rate	1.75%		1.75%