Pension and Other Post-Retirement Plans (Details 2) (Defined benefit pension plans, USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Defined benefit pension plans
Change in benefit obligation:
Benefit obligation at beginning of year	$ 91,270	$ 88,873
Service cost	2,128	2,097	1,750
Interest cost	4,719	4,576	4,799
Prior Service Cost	(2,518)	0
Participant contributions	1,192	1,079
Curtailments	0	0
Actuarial (gain) loss	(8,082)	(794)
Benefits paid	(2,536)	(2,440)
Settlement payments	0	(3,101)
Other, principally foreign exchange	3,516	(608)
Benefit obligation at end of year	105,853	91,270	88,873
Change in plan assets:
Fair value of plan assets at beginning of year	73,196	73,200
Business sale	0	0
Actual gain (loss) on plan assets	9,765	(876)
Employer contributions	3,620	2,859
Participant contributions	1,192	1,079
Benefits paid	(2,536)	(2,440)
Settlement payments	0	0
Other, principally foreign exchange	2,803	(626)
Fair value of assets at end of year	88,040	73,196	73,200
Amounts recognized in the consolidated balance sheets:
Funded status (current)	0	0
Funded status (noncurrent)	(17,813)	(18,074)
Accumulated other comprehensive income (pre-tax):
Unrecognized actuarial loss	19,905	16,537
Unrecognized prior service cost	(3,444)	(1,088)
Net amount recognized	(1,352)	(2,625)
Components of net periodic pension benefit cost:
Service cost	2,128	2,097	1,750
Interest cost	4,719	4,576	4,799
Expected return on plan assets	(5,176)	(5,170)	(4,767)
Amortization of actuarial gains/losses	788	382	503
Curtailments	0	0	1,692
Amortization of unrecognized prior service cost	(211)	(79)	(51)
Net periodic cost	2,248	1,806	3,926
Accumulated benefit obligation	102,066	83,874
Underfunded status of plan	$ 17,813	$ 18,074