Annual report pursuant to Section 13 and 15(d)

Income Taxes - Reconciliation of Income Taxes (Details)

v3.8.0.1
Income Taxes - Reconciliation of Income Taxes (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Effective Income Tax Rate Reconciliation, Amount [Abstract]      
U.S. statutory rate $ (24,136) $ 1,945 $ (13,556)
Increase (decrease) resulting from:      
Permanent differences 330 64 275
State income taxes (366) 32 0
Vesting of common stock 253 0 0
Other (274) 0 (88)
Income tax (benefit) expense $ (24,193) $ 2,041 $ (13,369)
Effective Income Tax Rate Reconciliation, Percent [Abstract]      
U.S. statutory rate 35.00% 35.00% 35.00%
Increase (decrease) resulting from:      
Permanent differences (0.50%) 1.10% (0.70%)
State income taxes 0.50% 0.60% 0.00%
Vesting of common stock (0.40%) 0.00% 0.00%
Other 0.50% 0.00% 0.20%
Income tax (benefit) expense 35.10% 36.70% 34.50%