Derivatives And Hedging (Narrative) (Details) $ in Thousands	1 Months Ended		9 Months Ended	12 Months Ended
	May. 31, 2015 USD ($)	May. 04, 2015 USD ($) derivative_contract	Sep. 30, 2015 USD ($) derivative_contract	Dec. 31, 2014 USD ($) derivative_contract	Sep. 30, 2014 USD ($)	Dec. 31, 2013 USD ($)
Derivatives, Fair Value [Line Items]
Other comprehensive income (loss), realized gain (loss)	$ 5,000
Accumulated other comprehensive loss			$ (9,029)	$ (12,436)	$ (2,378)	$ (4,202)
Gain (Loss) On Cash Flow Hedges [Member]
Derivatives, Fair Value [Line Items]
Accumulated other comprehensive loss			$ 6,062	$ 3,416	$ 2,648	$ 1,233
Interest Rate Contracts [Member] | Cash Flow Hedges [Member]
Derivatives, Fair Value [Line Items]
Number of active interest rate contracts held | derivative_contract		2	4	1
Derivative, maturity date			Mar. 01, 2020	Dec. 23, 2015
Notional amount of interest rate fair value hedge derivatives		$ 215,000	$ 205,200	$ 5,200
Derivative, lower fixed interest rate range			1.492%
Derivative, higher fixed interest rate range			2.445%
Derivative, fixed Interest rate				2.40%
Cash flow hedge gain (loss) to be amortized within 12 months			$ (1,400)
Interest Rate Contracts [Member] | Fair Value Hedges [Member]
Derivatives, Fair Value [Line Items]
Number of active interest rate contracts held | derivative_contract			2	2
Notional amount of interest rate fair value hedge derivatives			$ 64,100	$ 65,300
Derivative, fixed Interest rate			7.50%	7.50%
Derivative, lower variable interest rate range			4.29%	4.23%
Derivative, higher variable interest rate range			4.31%	4.26%
Interest Rate Swap [Member] | Cash Flow Hedges [Member]
Derivatives, Fair Value [Line Items]
Derivative, remaining maturity		10 years
Derivative, forward interest rate	2.00%