Pension (Reconciliation of Level 3 Inputs on Changes in Pension Plan Assets) (Details) (Defined Benefit Pension Plans and SERP, USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Change in fair value of plan assets:
Fair value of plan assets, beginning of year			$ 382,266
Fair value of plan assets, end of year	414,361	403,249	382,266
Level Three
Change in fair value of plan assets:
Fair value of plan assets, beginning of year	60,231	53,856
Change in unrealized appreciation (depreciation)	801	6,716
Net purchases (sales)	(2,500)	(341)
Fair value of plan assets, end of year	$ 58,532	$ 60,231