Annual report pursuant to Section 13 and 15(d)

Employee Retirement Plans - Defined Contribution and Nonqualified Plans (Details)

v3.8.0.1
Employee Retirement Plans - Defined Contribution and Nonqualified Plans (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Defined contribution plan      
Company's matching contributions $ 625 $ 863 $ 377
Non-discretionary employer contributions 1,128 901 1,264
Expense 1,278 1,221  
Non-qualified plan      
Defined contribution plan      
Expense 526 511 496
Amount accrued $ 4,980 3,471 2,482
Henderson Defined Contribution Plan      
Defined contribution plan      
Company's matching contributions     $ 299
Dejana Defined Contribution Plan      
Defined contribution plan      
Company's matching contributions   $ 119