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Commitments and Contingencies (Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Contractual Obligation Additional Investment in Alternative or Other Investments $ 143,700    
Purchase amount of annuities 17,900    
Rental expense for operating leases for office space, equipment, and vehicles $ 17,300 $ 17,400 $ 15,600
Capital Lease Agreements Expiration Period 2019    
Other Investments [Member]      
Remaining Commitment $ 143,686 $ 74,353