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Summary of Significant Accounting Policies - Deferred Costs & Impairment (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Summary of Significant Accounting Policies          
Impairment loss related to intangible assets $ 0   $ 0 $ 0  
Goodwill 40,646   40,646   $ 40,646
Impairment loss related to goodwill 0 $ 0 0 0  
Deferred Costs          
Amortization of initial direct costs 3,600 3,400 6,900 6,900  
Internal sales commissions 15,009   15,009   15,064
Third party commissions 12,442   12,442   10,845
Other 409   409   462
Total 27,860   27,860   $ 26,371
Recoverability of Long-Lived Assets          
Impairment of long-lived assets $ 0 $ 0 $ 0 $ 0