Annual report pursuant to Section 13 and 15(d)

STOCK-BASED COMPENSATION - Stock-Based Comp Expense (Details)

v3.8.0.1
STOCK-BASED COMPENSATION - Stock-Based Comp Expense (Details) - Time Lapse Restricted Shares - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Pre-tax compensation expense $ 12,399 $ 12,415 $ 12,110
Tax benefit (4,799) (4,805) (4,687)
Restricted stock expense, net of tax $ 7,600 $ 7,610 $ 7,423