STOCK AWARD PLANS Summary of Employee Stock Purchase Plan Activity (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares purchased by employees (shares)	46,445
Aggregate cost to employees	$ 2,782
Expense recognized by the company	4,841	$ 12,493	$ 30,626	$ 43,512
Company expense on ESPP discount
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expense recognized by the company	$ 491	$ 474	$ 2,038	$ 1,884