NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Share Repurchase Program and Advertising Expense (Details) - USD ($) shares in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Sep. 06, 2016	Mar. 20, 2014
Share Repurchase Program
Share repurchase program, authorized amount				$ 150,000,000.0	$ 150,000,000.0
Number of shares repurchased	4.9
Value of shares repurchased, gross	$ 136,400,000
Total remaining authorization amount	119,100,000.0
Advertising Expenses
Total advertising expenses	$ 18,500,000	$ 23,900,000	$ 21,300,000