Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Details of Reclassification) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Amount reclassified from accumulated other comprehensive loss
Prior service cost	$ 161	$ 161
Settlement expense	858	806
Amortization of actuarial loss	2,547	786
Total before tax	3,566	1,753
Income tax benefit	(1,209)	(617)
Amount reclassified out of accumulated other comprehensive loss	$ 2,357	$ 1,136