Accumulated Other Comprehensive Income (Loss), Accumulated Other Comprehensive Income (Loss) Reclassifications (Details) (Unrealized Gain (Loss) on Available-for-Sale Securities [Member], Reclassification out of Accumulated Other Comprehensive Income [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Rabbi Trust Assets [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Component of Selling, General, and Administrative Expense	$ 24	$ 1,966	$ 0
Other AFS Securities [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Component of Other Income	$ 54	$ 53	$ 0