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Fair Value Measurements (Company's Portfolio of Other Investments Measured Using Net Asset Valuations) (Details)
$ in Thousands
Mar. 31, 2017
USD ($)
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]  
Fair Value $ 216,103
Unfunded Commitments 243,917
Private equity partnerships  
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]  
Fair Value 192,975
Unfunded Commitments 218,142
Senior secured bank loan funds  
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]  
Fair Value 21,748
Unfunded Commitments 25,775
Hedge funds  
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]  
Fair Value 1,380
Unfunded Commitments $ 0