Employee Benefit Plans (Details) (USD $)	3 Months Ended
	Mar. 31, 2012
Change in Plan Assets [Roll Forward]
Discount rate	5.10%
Expected long-term return on plan assets	5.60%
Estimated Future Pension Benefit Payments [Abstract]
Defined Benefit Plan, Estimated Future Employer Contributions in Current Fiscal Year, Description	The Company adopted a payment plan with the trustees of the defined benefit plan, in which the Company paid approximately ₤1.0 million GBP (approximately $1.6 million based on a USD:GBP exchange rate of 1.6:1) every year from 2009 through 2011. The Company and the trustees are in discussions regarding the payment scheme.
Employee Benefit Plans Additional Information [Abstract]
Net period benefit costs	$ 0
Deferred Compensation Plan Assets	3,000,000
Pension Plans, Defined Benefit [Member]
Change in Benefit Obligation [Roll Forward]
Benefit obligation - beginning	109,877,000
Service cost	78,000
Interest cost	1,397,000
Actuarial gain	3,849,000
Benefits paid	(977,000)
Currency changes	3,207,000
Benefit obligation - ending	117,431,000
Change in Plan Assets [Roll Forward]
Fair value of plan assets - beginning	96,384,000
Actual return	2,254,000
Employer contribution	1,089,000
Benefits paid	(977,000)
Currency changes	2,774,000
Fair value of plan assets - ending	101,524,000
Funded status	$ (15,907,000)
Weighted average discount rate benefit obligations	5.10%
Estimated Future Pension Benefit Payments [Abstract]
USD:GBP exchange rate	0.625