Stockholders' Equity AOCI (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012
Components of accumulated other comprehensive loss
Foreign currency translation losses	$ (4,822)	$ (2,289)	$ (2,322)
Unrecognized pension and postretirement benefit costs, net of tax	(18,059)	(18,404)	(18,749)
Total accumulated other comprehensive loss	$ (22,881)	$ (20,693)	$ (21,071)