Accumulated Other Comprehensive Income, Reclassified (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Amortization of pension and postretirement benefit plans [Abstract]
Prior service benefit	$ (3,017)		$ (4,317)		$ (4,784)
Unrecognized loss	2,435		3,123		3,096
Income tax benefit	372		577		636
Total reclassifications for the period	210		617
Reclassification out of Accumulated Other Comprehensive Income [Member]
Amortization of pension and postretirement benefit plans [Abstract]
Prior service benefit	(3,017)	[1]	(4,317)	[1]
Unrecognized loss	2,435	[1]	3,123	[1]
Total before income tax	(582)		(1,194)
Income tax benefit	372		577
Total reclassifications for the period	$ (210)		$ (617)

[1] These accumulated other comprehensive income components are included in the computation of net periodic pension and postretirement benefit costs, which are included in selling, general and administrative expenses in our consolidated statements of operations (see Notes 13 and 14 for additional details).