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SHAREHOLDERS' EQUITY (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 6 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Series A Preferred Stock [Member]
Dec. 31, 2012
Series A Preferred Stock [Member]
Jun. 30, 2013
Common Stock [Member]
Jun. 30, 2013
Additional Paid-in Capital [Member]
Jun. 30, 2013
Accumulated Deficit [Member]
Jun. 30, 2013
Accumulated Other Comprehensive Income (Loss) [Member]
Jun. 30, 2013
Treasury Stock [Member]
Increase (Decrease) in Shareholders' Equity [Roll Forward]                      
BALANCE (in shares)         200,000 200,000 46,561,437       205,902,000
BALANCE     $ 350,235   $ 2 $ 2 $ 465 $ 564,883 $ (204,211) $ (5,702) $ (5,202)
Net income 15,382 10,964 10,624 9,743         10,624    
Other comprehensive income 209 214 375 258           375  
Repurchase of common stock (in shares)                     (195,599,000)
Repurchase of common stock     (5,456)               (5,456)
Exercise of common stock options, net of tendered shares (in shares)             24,020        
Exercise of common stock options, net of tendered shares     271       0 271      
Stock-based employee compensation, net of shares withheld for employee taxes (in shares)             (13,882) [1]        
Stock-based employee compensation, net of shares withheld for employee taxes     328 [1]       0 [1] 328 [1]      
Issuance of common stock to Board of Directors and Scientific Advisory Board (in shares)             29,153 [2]        
Issuance of common stock to Board of Directors and Scientific Advisory Board     694 [2]       1 [2] 693 [2]      
Issuance of common stock under an Employee Stock Purchase Plan (in shares)             7,775        
Issuance of common stock under an Employee Stock Purchase Plan     234       0 234      
BALANCE (in shares)         200,000 200,000 46,608,503       401,501,000
BALANCE 357,305   357,305   2 2 466 566,409 (193,587) (5,327) (10,658)
Shares issued to employees, earned in prior period     435                
Shares issued to employees, earned in prior period (in shares)     13,356                
Shares withheld for employees' tax withholding obligations, earned in prior period     153                
Shares withheld for employees' tax withholding obligations, earned in prior period (in shares)     4,672                
Shares issued to Board of Directors and Scientific Advisory Board, earned in prior period     $ 300                
Shares issued to Board of Directors and Scientific Advisory Board, earned in prior period (in shares)     9,212                
[1] Includes $435 (13,356 shares) that was accrued for in a previous period and charged to expense when earned, but issued in 2013, less shares withheld for taxes in the amount of $153 (4,672 shares).
[2] Includes $300 (9,212 shares) that was earned in a previous period and charged to expense when earned, but issued in 2013.