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CAPITAL STOCK AND STOCK AWARD PLANS - Summary of Employee Stock Purchase Plan Activity (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares Purchased By Employees (in shares) 225,241 228,103 231,564
Aggregate Cost to Employees $ 14,032 $ 13,045 $ 11,943
Expense Recognized By the Company 37,565 57,661 47,861
Company expense on ESPP discount      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expense Recognized By the Company $ 2,475 $ 2,269 $ 2,108