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Summary of Significant Accounting Policies - Accounting Standards (Details)
$ in Thousands
Jan. 01, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
equity_security
Debt Securities, Available-for-sale [Line Items]      
Number of equity securities | equity_security     1
Debt Securities, Available-for-sale   $ 88,179 $ 93,383
Equity Funds [Member]      
Debt Securities, Available-for-sale [Line Items]      
Debt Securities, Available-for-sale   $ 0 $ 499
Accounting Standards Update 2016-02 [Member] | Pro Forma [Member]      
Debt Securities, Available-for-sale [Line Items]      
Operating Lease, Right-of-Use Asset $ 6,700