COMMON STOCK PLANS - Stock Repurchase Program (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Oct. 22, 2014
Common Stock
Equity, Class of Treasury Stock [Line Items]
Purchase and retirement of shares (in shares)		0	0
Common Stock
Equity, Class of Treasury Stock [Line Items]
Stock repurchase program, authorized amount (up to)				$ 3,600,000
Stock repurchase program, remaining authorized repurchase amount	$ 3,373,161
Shares acquired in connection with stock compensation plans (in shares)	60,762	88,320	73,126