Quarterly report pursuant to Section 13 or 15(d)

Deferred Costs - Additional Information (Details)

v3.19.3
Deferred Costs - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]          
Amortization of intangible assets $ 2,140 $ 2,990 $ 7,180 $ 11,390  
Finite-lived intangible assets, accumulated amortization $ 55,360   $ 55,360   $ 50,550