Pension and Other Post-Retirement Benefit Plans (Schedule of Net Benefit Costs and Amounts Recognized in Other Comprehensive Income (Loss)) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Defined Benefit Plan Disclosure [Line Items]
Gain on termination of retiree medical plan	$ 0	$ 0	$ (4,693)
U.S. Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	989	913	0
Interest cost	11,505	11,078	1,307
Amortization of unrecognized net loss	387	364	390
Expected return on plan assets	(10,527)	(9,621)	(711)
Net periodic benefit cost	2,354	2,734	986
Net (gain) loss arising during the year	23,330	2,731	(473)
Net (gain) loss recognized during the year	(387)	(363)	(390)
Total recognized in other comprehensive income	22,943	2,368	(863)
Total recognized in net periodic benefit cost and other comprehensive income	25,297	5,102	123
Non-U.S. Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	2,054	228	173
Interest cost	3,527	129	122
Amortization of unrecognized net loss	(14)	3	(7)
Amortization of prior service credit	8	5	0
Expected return on plan assets	(10)	(9)	(10)
Net periodic benefit cost	5,565	356	278
Net (gain) loss arising during the year	1,085	411	375
Net (gain) loss recognized during the year	14	(3)	7
Amortization of prior service credit	(8)	(5)	89
Exchange rate gain (loss)	(76)	(9)	6
Total recognized in other comprehensive income	1,015	394	477
Total recognized in net periodic benefit cost and other comprehensive income	6,580	750	755
Other Post-retirement Benefits U.S. Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0	25
Interest cost	0	0	162
Gain on termination of retiree medical plan	0	0	(4,693)
Net periodic benefit cost	0	0	(4,506)
Net (gain) loss recognized during the year	0	0	137
Total recognized in other comprehensive income	0	0	137
Total recognized in net periodic benefit cost and other comprehensive income	$ 0	$ 0	$ (4,369)