Income Taxes (Change in Deferred Income Taxes) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Period Change in Deferred Taxes [Line Items]
Deferred tax changes reflected in other comprehensive income	$ (10,565)	$ (2,698)	$ (27,285)
Deferred tax changes reflected in Federal income tax expense	47,269	44,666
Net decrease/(increase) in DTA	$ 36,704	$ 41,968