Annual report pursuant to Section 13 and 15(d)

Equity-Based Compensation Equity-Based Compensation - 401(k) Retirement Savings Plan (Details)

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Equity-Based Compensation Equity-Based Compensation - 401(k) Retirement Savings Plan (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Retirement Benefits [Abstract]      
Employer 401(K) retirement savings plan contribution Amount $ 889 $ 872 $ 862