Financial Derivatives - Hedging Description (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Gain (Loss) on Fair Value Hedges Recognized in Earnings	$ (4,100)	$ (5,600)	$ (8,900)	$ (11,100)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	500	200	1,000	400
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net	2,100		2,100
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net of Tax	1,300		1,300
Gain (Loss) on Discontinuation of Interest Rate Cash Flow Hedge Due to Forecasted Transaction Probable of Not Occurring, Net	$ 0	$ 0	$ 0	$ 0