Annual report pursuant to Section 13 and 15(d)

Income Tax - Reconciliation of income tax expense (benefit) (Details)

v3.8.0.1
Income Tax - Reconciliation of income tax expense (benefit) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Effective Income Tax Rate Reconciliation, Amount      
Statutory U.S. Federal tax rate (as a percent) 35.00% 35.00% 35.00%
Federal income tax expense $ 10,005 $ 5,646 $ 439
State income tax expense, net of federal benefit 952 479 44
Non-deductible equity-based compensation 13,296    
Non-deductible IPO expenses 1,948 309  
Other 60 (15)  
Total income tax expense $ 26,261 $ 6,419 $ 483