STOCKHOLDERS' EQUITY (Narrative) (Details) $ / shares in Units, $ in Thousands		3 Months Ended		12 Months Ended
	May. 19, 2014 shares	Jun. 30, 2015 USD ($) shares	Jun. 30, 2014 USD ($) $ / shares shares	Dec. 31, 2015 USD ($) $ / shares shares	Dec. 31, 2014 USD ($) $ / shares shares	Dec. 31, 2013 USD ($) shares	May. 31, 2014 USD ($)
Class of Stock [Line Items]
Common stock, authorized (in shares)				100,000,000	100,000,000
Common stock, par value (in dollars per share) | $ / shares				$ 0.001	$ 0.001
Preferred stock, authorized (in shares)				10,000,000	10,000,000
Preferred stock, par value (in dollars per share) | $ / shares				$ 0.001	$ 0.001
Preferred stock, issued (in shares)				0	0
Preferred Stock, Shares Outstanding				0	0
Common stock issuance (in shares)		442,000
Common stock issuance | $		$ 15,100		$ 15,089
Value of treasury stock withheld | $				$ 6,330	$ 2,056	$ 4,913
Common Stock [Member]
Class of Stock [Line Items]
Common stock issuance (in shares)				442,000
Common stock issuance | $				$ 1
Shares withheld to satisfy tax obligations (in shares)				145,000	83,000	296,000
Treasury Stock [Member]
Class of Stock [Line Items]
Value of treasury stock withheld | $				$ 6,330	$ 2,056	$ 4,913
Beneficial Owner [Member] | Whippoorwill Associates, Inc. [Member]
Class of Stock [Line Items]
Number of shares acquired for all transactions (in shares)	3,000,000
Percentage ownership after all transactions	0.21
Legal Fees | $			$ 100
Repurchase of Treasury Shares [Member] | Beneficial Owner [Member] | Whippoorwill Associates, Inc. [Member]
Class of Stock [Line Items]
Shares withheld to satisfy tax obligations (in shares)			200,000	0
Value of treasury stock withheld | $			$ 4,800
Repurchase of shares (in dollars per share) | $ / shares			$ 24.12
May 2014 Authorized Program [Member] | Common Stock [Member]
Class of Stock [Line Items]
Stock Repurchase Program, Authorized Amount | $							$ 50,000