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Fair Value Measurements (Company's Portfolio of Other Investments Measured Using Net Asset Valuations) (Details)
$ in Thousands
Mar. 31, 2018
USD ($)
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]  
Fair Value $ 216,118
Unfunded Commitments 441,432
Private equity partnerships  
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]  
Fair Value 190,067
Unfunded Commitments 416,135
Senior secured bank loan funds  
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]  
Fair Value 13,771
Unfunded Commitments 25,297
Hedge funds  
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]  
Fair Value 12,280
Unfunded Commitments $ 0