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Retirement Benefit Arrangements (Details - Other Details) - Zurich Plan - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Defined Benefit Plan Plan Assets [Line Items]      
Fair value of plan assets at end of year $ 100,710 $ 93,264  
Defined Benefit Plan Other Details [Abstract]      
Net amounts recognized in accumulated other comprehensive income 29,200 25,400  
Tax on amounts recognized in accumulated other comprehensive income 7,900 6,800  
Net periodic benefit cost 9,600 7,300 $ 10,700
Estimated contributions for next fiscal year $ 4,900    
Plan assets to be returned The Company does not believe that any of the Zurich Plan’s assets will be returned to the Company during 2016.    
Significant other observable inputs (Level 2) | Insured Funds [Member]      
Defined Benefit Plan Plan Assets [Line Items]      
Fair value of plan assets at end of year $ 100,700 $ 93,300