Employee Benefit Plans (Details) (USD $)	9 Months Ended
	Sep. 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
Defined Benefit Plans, General Information	The Company has a contributory defined benefit plan that covers certain employees in the United Kingdom (“U.K.”). The net pension and supplemental retirement benefit obligations and the related periodic costs are based on, among other things, assumptions regarding the discount rate, estimated return on plan assets and mortality rates. These obligations and related periodic costs are measured using actuarial techniques and assumptions.
Defined Benefit Plan, Pension, Method to Determine Vested Benefit Obligation	The projected unit credit method is the actuarial cost method used to compute the pension liabilities and related expenses.
Pension Plans, Defined Benefit [Member]
Change in Benefit Obligation [Roll Forward]
Benefit obligation - beginning	109,877,000
Service cost	237,000
Interest cost	4,220,000
Actuarial gain	3,035,000
Benefits paid	(2,685,000)
Currency changes	4,407,000
Benefit obligation - ending	119,091,000
Change in Plan Assets [Roll Forward]
Fair value of plan assets - beginning	96,384,000
Actual return	3,802,000
Employer contribution	1,104,000
Benefits paid	(2,685,000)
Currency changes	3,819,000
Fair value of plan assets - ending	102,424,000
Funded status	$ (16,667,000)
Weighted average discount rate benefit obligations	4.60%
Estimated Future Pension Benefit Payments [Abstract]
USD:GBP exchange rate	0.625