Annual report pursuant to Section 13 and 15(d)

Employee Benefit Plans (Details)

v3.10.0.1
Employee Benefit Plans (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined contribution plan, employer contribution amount $ 2,082 $ 1,292 $ 1,018
Share-based compensation expense - Equity-based 9,460 10,225 4,536
401(k) CPE stock fund contributions      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Share-based compensation expense - Equity-based $ 600 $ 313 $ 277