Annual report pursuant to Section 13 and 15(d)

STOCK BASED AND DEFERRED COMPENSATION - Summary of Compensation Expense and Stock Award Activity (Details)

v3.8.0.1
STOCK BASED AND DEFERRED COMPENSATION - Summary of Compensation Expense and Stock Award Activity (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Summary of compensation expense and stock award activity      
Stock-based compensation expense $ 12,056 $ 13,741 $ 15,781
Cash received by Company from exercises $ 0 $ 232 $ 2,886