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Goodwill and Intangible Assets - Goodwill (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2020
Goodwill      
Gross carrying Amount   $ 430,331 $ 430,331
Accumulated Impairment   246,029 248,388
Net amount $ 181,943 184,302 $ 181,943
Allocated to Assets held for sale $ 2,359    
Goodwill impairment   $ 122,800