Pension and Other Postretirement Benefit Plans (Changes in the pension benefit obligation and plan assets) (Details) (USD $) In Thousands, unless otherwise specified									12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012 Foreign Plan [Member]	Dec. 31, 2011 Foreign Plan [Member]	Dec. 31, 2010 Foreign Plan [Member]
Change in benefit obligation:
Benefit obligation at beginning of year									$ 26,723	$ 25,340
Service cost									671	793	629
Interest cost									651	717	614
Plan participant contributions									1,602	637
Benefits paid									(668)	(1,254)
Actuarial loss									1,659	735
Administrative expenses paid									0	(79)
Settlements									(1,417)	0
Effect of foreign currency translation									735	(166)
Projected benefit obligation at end of year									29,956	26,723	25,340
Changes in plan assets:
Fair value of plan assets at beginning of year									33,082	30,662
Actual return on plan assets									2,670	2,581
Company contributions									732	778	635
Plan participant contributions									1,602	637
Benefits paid									(668)	(1,254)
Administrative expenses paid									0	(79)
Settlements									(1,417)	0
Effect of foreign currency translation									894	(243)
Fair value of plan assets at end of year									36,895	33,082	30,662
Funded status at end of year	$ 6,939	$ 6,945	$ 6,685	$ 6,815	$ 6,359	$ 6,125	$ 6,387	$ 5,642	$ 6,939	$ 6,359