Unaudited Condensed Consolidated Statements of Comprehensive Income (Loss) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (3,624)	$ 5,147	$ (5,148)	$ 9,569
Foreign currency translation adjustment	258	(543)	84	(64)
Deferred gain on available for sale securities	174	48	237	292
Current period cash flow hedging activity, net of $583 and $808 tax benefit in the three and six months ended June 30, 2014, respectively, and $356 and $432 tax expense in the three and six months ended June 30, 2013, respectively.	(1,043)	577	(1,450)	697
Reclassification of hedging activities into earnings, net of $91 and $187 tax benefit in the three and six months ended June 30, 2014, respectively, and $77 and $170 tax benefit in the three and six months ended June 30, 2013, respectively.	173	124	353	273
Reclassification of pension and postretirement adjustments into earnings, net of $77 and $160 tax benefit in the three and six months ended June 30, 2014, respectively, and $264 and $408 tax benefit in the three and six months ended June 30, 2013, respectively.	115	363	273	805
Total other comprehensive income (loss)	(323)	569	(503)	2,003
Comprehensive income (loss)	$ (3,947)	$ 5,716	$ (5,651)	$ 11,572