Derivatives (Gains/(Losses) on Derivatives Associated with Cash Flow Hedges) (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2017	Mar. 31, 2016
Derivative Instruments, Gain (Loss) [Line Items]
Gain/Loss expected to be reclassified to earnings in the next twelve months		$ 1,500
Cash Flow Hedge | Hedging Instruments [Member] | Interest Rate Swaps [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gains/(Losses)	[1],[2]	$ (3,101)	$ 5,618

[1] Includes approximately $ 1.5 million of losses expected to be reclassified into earnings in the next twelve months

[2] Amount represents the pre-tax gains/(losses) included within AOCI