Pension Arrangements (Assets Held In Rabbi Trust) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Assets held in rabbi trust	$ 50,490	$ 53,231
Company-owned variable life insurance
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Assets held in rabbi trust	45,895	45,581
Mutual fund investments
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Assets held in rabbi trust	$ 4,595	$ 7,650