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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (USD $) In Thousands, except Share data, unless otherwise specified | Total | Common Stock [Member] | Additional Paid-in Capital [Member] | Accumulated Deficit [Member] | Accumulated Other Comprehensive Income Loss [Member] | Treasury Stock [Member] | Series A Nonconvertible Preferred Stock [Member] Preferred Stock [Member]
--- | --- | --- | --- | --- | --- | --- | ---
BALANCE at Dec. 31, 2013 | $ 427,686 | $ 468 | $ 572,401 | $ (130,159) | $ (4,368) | $ (10,658) | $ 2
BALANCE (in shares) at Dec. 31, 2013 |  | 46,825,168 |  |  |  | 401,501 | 200,000
Increase (Decrease) in Shareholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income | 24,443 |  |  | 24,443 |  |  |
Other comprehensive income | 221 |  |  |  | 221 |  |
Repurchase of common stock, shares |  |  |  |  |  | 234,800 |
Repurchase of common stock | (7,000) |  |  |  |  | (7,000) |
Exercise of common stock options, shares |  | 42,597 |  |  |  |  |
Exercise of common stock options | 664 | 1 | 663 |  |  |  |
Issuance of common stock to employees, shares |  | 82,534 |  |  |  |  |
Issuance of common stock to employees | 4,272 | 1 | 4,271 |  |  |  |
Shares withheld for employee taxes, shares |  | (83,385) |  |  |  |  |
Shares withheld for employee taxes | (2,830) | (1) | (2,829) |  |  |  |
Issuance of common stock to Board of Directors and Scientific Advisory Board Shares |  | 26,984 |  |  |  |  |
Issuance of common stock to Board of Directors and Scientific Advisory Board Value | 786 | 0 | 786 |  |  |  |
Issuance of common stock to employees under an Employee Stock Purchase Plan (ESPP) (in shares) |  | 5,951 |  |  |  |  |
Issuance of common stock to employees under an ESPP | 162 | 0 | 162 |  |  |  |
BALANCE at Jun. 30, 2014 | $ 448,404 | $ 469 | $ 575,454 | $ (105,716) | $ (4,147) | $ (17,658) | $ 2
BALANCE (in shares) at Jun. 30, 2014 |  | 46,899,849 |  |  |  | 636,301 | 200,000

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