FINANCING ARRANGEMENTS - Long-term Debt (Details) - USD ($)	Sep. 30, 2016	Jun. 30, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Net carrying amount of long-term debt	$ 119,855,000	$ 119,606,000
Senior term notes | Senior Term Notes 5.50%
Debt Instrument [Line Items]
Interest rate percentage	5.50%		5.50%
Net carrying amount of long-term debt	$ 119,855,000	119,606,000
Line of Credit | Revolving Credit Facility
Debt Instrument [Line Items]
Net carrying amount of long-term debt	$ 0	$ 0