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Fair Value Measurements - Financial Assets and Liabilities Accounted at Fair Value (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Registered investment companies    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Registered investment companies [1] $ 3,472 $ 3,576
[1] Registered investment companies are classified as available-for-sale securities and are valued using quoted prices in active markets multiplied by the number of shares owned.