Annual report pursuant to Section 13 and 15(d)

Benefit Plans - Defined Contribution Plan (Details)

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Benefit Plans - Defined Contribution Plan (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Retirement Benefits [Abstract]      
Defined Contribution expense $ 12,702 $ 12,585 $ 13,103