Annual report pursuant to Section 13 and 15(d)

Property and Equipment - Narrative (Details)

v3.19.1
Property and Equipment - Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Property, Plant and Equipment [Abstract]      
Depreciation $ 11,434 $ 8,818 $ 8,160