Accumulated Other Comprehensive Loss (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Components of Accumulated Other Comprehensive Loss
Foreign currency translation adjustments	$ (20,127)		$ (20,127)		$ (21,991)
Pension and retiree medical benefits	(2,922)		(2,922)		(2,980)
Total Accumulated Other Comprehensive Loss	(23,049)		(23,049)
Changes in components of Accumulated Other Comprehensive Loss
Balance at the beginning of the year			(24,971)
Other comprehensive income (loss) before reclassifications			1,864
Amounts reclassified from Accumulated Other Comprehensive Loss			58
Total Other Comprehensive Income (Loss), net of tax	843	(1,854)	1,922	(3,010)
Balance at the end of the period	(23,049)		(23,049)
Foreign Currency Translation Adjustments
Components of Accumulated Other Comprehensive Loss
Total Accumulated Other Comprehensive Loss	(20,127)		(20,127)
Changes in components of Accumulated Other Comprehensive Loss
Balance at the beginning of the year			(21,991)
Other comprehensive income (loss) before reclassifications			1,864
Amounts reclassified from Accumulated Other Comprehensive Loss			0
Total Other Comprehensive Income (Loss), net of tax			1,864
Balance at the end of the period	(20,127)		(20,127)
Pension and Post Retirement Benefits
Components of Accumulated Other Comprehensive Loss
Total Accumulated Other Comprehensive Loss	(2,922)		(2,922)
Changes in components of Accumulated Other Comprehensive Loss
Balance at the beginning of the year			(2,980)
Other comprehensive income (loss) before reclassifications			0
Amounts reclassified from Accumulated Other Comprehensive Loss			58
Total Other Comprehensive Income (Loss), net of tax			58
Balance at the end of the period	$ (2,922)		$ (2,922)