STOCK AWARD PLANS Summary of Employee Stock Purchase Plan Activity (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares purchased by employees (shares)	48,943
Aggregate cost to employees	$ 3,094
Expense recognized by the company	10,606	$ 15,683	$ 25,785	$ 31,019
Company expense on ESPP discount
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expense recognized by the company	$ 547	$ 517	$ 1,549	$ 1,410