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Commitments and Contingencies (Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Purchase amount of annuities $ 15,800    
Rental expense for operating leases for office space and equipment $ 17,400 $ 15,600 $ 13,200
Capital Lease Agreements Expiration Period 2018    
Other Investments [Member]      
Remaining Commitment $ 74,353