STOCKHOLDERS' EQUITY, Stock options by Exercise Price Range (Details)	12 Months Ended
	Dec. 31, 2016 $ / shares shares
Stock Options by Exercise Price [Abstract]
Number of Shares Outstanding (in shares) | shares	297,000
Weighted Average Life	3 years 1 month 6 days
Weighted Average Exercise Price (in dollars per share)	$ 20.14
Number of Shares Exercisable (in shares) | shares	250,750
Weighted Average Option Price (in dollars per share)	$ 17.88
Weighted Average Life	2 years 7 months 6 days
4.00-5.50 [Member]
Stock Options by Exercise Price [Abstract]
Range of Options Exercise Prices, Lower Limit (in dollars per share)	$ 4.00
Range of Options Exercise Prices, Upper Limit (in dollars per share)	$ 5.50
Number of Shares Outstanding (in shares) | shares	35,000
Weighted Average Life	8 months 16 days
Weighted Average Exercise Price (in dollars per share)	$ 5.24
Number of Shares Exercisable (in shares) | shares	35,000
Weighted Average Option Price (in dollars per share)	$ 5.24
Weighted Average Life	8 months 16 days
13.24-15.85 [Member]
Stock Options by Exercise Price [Abstract]
Range of Options Exercise Prices, Lower Limit (in dollars per share)	$ 13.24
Range of Options Exercise Prices, Upper Limit (in dollars per share)	$ 15.85
Number of Shares Outstanding (in shares) | shares	60,000
Weighted Average Life	3 years 6 months 29 days
Weighted Average Exercise Price (in dollars per share)	$ 14.61
Number of Shares Exercisable (in shares) | shares	60,000
Weighted Average Option Price (in dollars per share)	$ 14.61
Weighted Average Life	3 years 6 months 29 days
17.00-21.00 [Member]
Stock Options by Exercise Price [Abstract]
Range of Options Exercise Prices, Lower Limit (in dollars per share)	$ 17.00
Range of Options Exercise Prices, Upper Limit (in dollars per share)	$ 21.00
Number of Shares Outstanding (in shares) | shares	125,000
Weighted Average Life	2 years 4 months 20 days
Weighted Average Exercise Price (in dollars per share)	$ 19.69
Number of Shares Exercisable (in shares) | shares	121,250
Weighted Average Option Price (in dollars per share)	$ 19.74
Weighted Average Life	2 years 3 months 4 days
26.43-37.64 [Member]
Stock Options by Exercise Price [Abstract]
Range of Options Exercise Prices, Lower Limit (in dollars per share)	$ 26.43
Range of Options Exercise Prices, Upper Limit (in dollars per share)	$ 37.64
Number of Shares Outstanding (in shares) | shares	77,000
Weighted Average Life	4 years 11 months 19 days
Weighted Average Exercise Price (in dollars per share)	$ 31.95
Number of Shares Exercisable (in shares) | shares	34,500
Weighted Average Option Price (in dollars per share)	$ 29.83
Weighted Average Life	3 years 11 months 26 days