Retirement Benefit Arrangements (Tables)

12 Months Ended

Dec. 31, 2011

Disclosure - Retirement Benefit Arrangements [Abstract]

Funded status of Zurich plan

		2011		2010
Funded status
Unfunded pension obligation at beginning of year	$	17,144	$	9,117
Change in pension obligation
Service cost		7,141		5,683
Interest cost		3,308		3,020
Plan participants’ contributions		2,174		5,761
Actuarial loss		8,470		7,268
Benefits paid		(248)		(7,562)
Foreign currency adjustments		(850)		9,994
Settlements		(13,178)		—
Change in pension obligation		6,817		24,164
Change in fair value of plan assets
Actual return on plan assets		3,610		3,181
Employer contributions		6,627		6,025
Plan participants’ contributions		2,174		5,761
Benefits paid		(248)		(7,562)
Foreign currency adjustments		(186)		8,732
Settlements		(13,178)		—
Change in fair value of plan assets		(1,201)		16,137
Funded status
Unfunded pension obligation at end of year	$	25,162	$	17,144
Additional information:
Projected benefit obligation	$	121,156	$	114,339
Accumulated pension obligation		116,904		110,240
Fair value of plan assets		95,994		97,195

Assumptions used

	2011					2010					2009
		Pension		Net periodic			Pension		Net periodic			Pension		Net periodic
		obligation		benefit cost			obligation		benefit cost			obligation		benefit cost
Discount rate		2.50	%	2.75	%		2.75	%	3.25	%		3.25	%	2.75	%
Expected return on plan assets		—		3.0			—		3.6			—		3.0
Rate of compensation increase		3.5		3.5			3.5		3.5			3.5		3.5

Expected future benefit payments

Period		Amount
2012	$	4,724
2013		4,666
2014		4,646
2015		5,190
2016		5,215
2017 to 2021		27,051