Quarterly report pursuant to Section 13 or 15(d)

Deferred Costs - Additional Information (Details)

v3.19.1
Deferred Costs - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]      
Amortization of intangible assets $ 2,630 $ 4,300  
Finite-lived intangible assets, accumulated amortization $ 52,160   $ 50,550