STOCKHOLDERS' EQUITY (Narrative) (Details) - USD ($)	3 Months Ended												12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	May 03, 2016
Stockholders Equity Description [Line Items]
Exercise of stock options													$ 2,760,000	$ 3,182,000	$ 314,000
Employee tax withholdings related to the vesting of equity awards													$ 2,657,000	$ 2,610,000	$ 1,476,000
Dividend paid per share to all stockholders of record (in Dollars per Share)	$ 0.175	$ 0.175	$ 0.175	$ 0.175	$ 0.175	$ 0.175	$ 0.175	$ 0.175	$ 0.175	$ 0.175	$ 0.175	$ 0.175
Preferred stock, shares authorized (in Shares)	5,000,000				5,000,000								5,000,000	5,000,000
Dividend Declared [Member]
Stockholders Equity Description [Line Items]
Dividends payable (in Description)													Quarterly
Dividends payable, amount per share (in Dollars per Share)	$ 0.175												$ 0.175
Dividends payable, date to be paid (Date)													Mar. 20, 2017
Dividends payable, date of record (Date)													Mar. 09, 2017
Stock Option [Member]
Stockholders Equity Description [Line Items]
Exercise of stock options (in Shares)													286,000	335,000	32,000
Common Stock [Member]
Stockholders Equity Description [Line Items]
Exercise of stock options (in Shares)													286,000	335,000	32,000
Common stock surrendered by employees in satisfaction of minimum tax withholding associated with equity award vesting (in Shares)													128,000	140,000	91,000
Employee tax withholdings related to the vesting of equity awards													$ 2,657,000	$ 2,610,000	$ 1,476,000
Common stock issued for services (in Shares)													27,000	22,000	29,000
Common stock authorized to repurchase amount																$ 50,000,000
Stock repurchased during period, shares													0
Common Stock [Member] | Stock Option [Member]
Stockholders Equity Description [Line Items]
Exercise of stock options (in Shares)													286,000	335,000	32,000