Accumulated Other Comprehensive Income (Loss) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract]
Cumulative currency translation adjustment, Change	$ 3,302	$ (25,810)
Benefit plan liability, net of tax (1)	(36,360)	(32,620)
Fair value change of derivatives, Change	79	80
Accumulated other comprehensive income	(32,979)	(58,350)
Fair value change of derivatives, Beginning balance	171	91
Cumulative currency translation Beginning balance	15,018	40,828
Benefit plan liability, Beginning balance	(27,658)	4,962
Accumulated other comprehensive loss, Beginning balance	(12,469)	45,881
Fair value change of derivatives, Ending balance	250	171
Cumulative currency translation Ending balance	18,320	15,018
Benefit plan liability, Ending balance	(64,018)	(27,658)
Accumulated other comprehensive loss, Ending balance	$ (45,448)	$ (12,469)