Employee Benefit Plans (Details) (USD $)	6 Months Ended
	Jun. 30, 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	During the second quarter of 2012, the Company adopted a payment plan with the trustees of the defined benefit plan, in which the Company will pay approximately ₤2 million GBP (approximately $3 million based on a USD:GBP exchange rate of 1.6:1) every year from 2012 through 2019.
Defined Benefit Plan, Expected Future Benefit Payments in Year One	$ 3,000,000
Defined Benefit Plan, Expected Future Benefit Payments in Year Two	3,000,000
Defined Benefit Plan, Expected Future Benefit Payments in Year Three	3,000,000
Defined Benefit Plan, Expected Future Benefit Payments in Year Four	3,000,000
Defined Benefit Plan, Expected Future Benefit Payments in Year Five	3,000,000
Defined Benefit Plan, Expected Future Benefit Payments in Three Fiscal Years Thereafter	3,000,000
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	158,000
Interest cost	2,821,000
Actuarial gain	3,048,000
Benefits paid	(1,832,000)
Currency changes	994,000
Benefit obligation - ending	115,066,000
Change in Plan Assets [Roll Forward]
Fair value of plan assets - beginning	96,384,000
Actual return	1,850,000
Employer contribution	1,103,000
Benefits paid	(1,832,000)
Currency changes	886,000
Fair value of plan assets - ending	98,391,000
Funded status	$ (16,675,000)
Weighted average discount rate benefit obligations	4.80%
Estimated Future Pension Benefit Payments [Abstract]
USD:GBP exchange rate	0.625