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Shareholders' Equity and Stock Options (Details Textual) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended |  |  | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2013 Maximum [Member] | Dec. 31, 2013 Minimum [Member] | Dec. 31, 2013 Restricted Stock Units (RSUs) [Member] Maximum [Member] | Dec. 31, 2013 Restricted Stock Units (RSUs) [Member] Minimum [Member] | Dec. 31, 2013 Employee Stock Option [Member] Minimum [Member] | Dec. 31, 2013 Common Stock [Member] | Dec. 31, 2012 Common Stock [Member]
Shareholders Equity and Stock Options (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |
Amount of share repurchase authorized |  |  |  | $ 50,000 |  |  |  |  | $ 50,000 |
Shares repurchased from December 7, 2011 through December 31, 2011 |  |  |  |  |  |  |  |  | 154,708 |
Shares repurchased under the Dec. 7, 2011 repurchase program, total |  |  |  |  |  |  |  |  | 1,244,232 |
Vested period of grant date |  |  |  |  |  | 5 years | 1 year | 4 years |  |
Expiration period of options from the date of grant |  |  |  |  | 7 years |  |  |  |  |
Shares repurchased during 2013 |  |  |  |  |  |  |  |  | 173,629 |
Aggregate cost of shares repurchased during 2013 | 3,889 |  |  |  |  |  |  |  |  |
Shareholders Equity and Stock Options (Additional Textual) [Abstract] |  |  |  |  |  |  |  |  |  |
Weighted average prices of vested and exercisable options |  | $ 14.28 | $ 15.57 |  |  |  |  |  |  |
Aggregate intrinsic (in-the-money) values of vested options | 4,908 |  |  |  |  |  |  |  |  |
Aggregate intrinsic options outstanding | 13,397 |  |  |  |  |  |  |  |  |
Percentage of December 31, 2010 outstanding shares repurchased from December 7, 2011 through December 31, 2011 |  |  |  |  |  |  |  |  | 0.40% |
Percentage of December 31, 2011 outstanding shares repurchased during 2012 | 2.30% |  |  |  |  |  |  |  |  |
Aggregate cost of shares repurchased from December 7, 2011 through December 31, 2011 | 2,047 |  |  |  |  |  |  |  |  |
Aggregate cost of shares repurchased during 2012 | 15,735 |  |  |  |  |  |  |  |  |
Average price per share of shares repurchased from December 7, 2011 through December 31, 2011 | $ 13.21 |  |  |  |  |  |  |  |  |
Average price per share of shares repurchased during 2012 | $ 17.16 |  |  |  |  |  |  |  |  |
Average price per share of shares repurchased under the Dec. 7, 2011 repurchase program, total | $ 17.40 |  |  |  |  |  |  |  |  |
Remaining Common stock authorized for future repurchases | $ 28,354 |  |  |  |  |  |  |  |  |
Shares of common stock in connection with the conversion of restricted stock units |  |  | 60,126 |  |  |  |  |  |  |
Shares held in treasury | 23,117,554 |  |  |  |  |  |  |  |  |
Preferred stock, shares authorized | 1,000,000 | 1,000,000 |  |  |  |  |  |  |  |
Preferred stock, par value | $ 0.001 | $ 0.001 |  |  |  |  |  |  |  |
Grant date intrinsic value | $ 0 |  |  |  |  |  |  |  |  |
Closing stock price per share | $ 31.54 |  |  |  |  |  |  |  |  |
Average price per share of shares repurchased during 2013 | $ 22.38 |  |  |  |  |  |  |  |  |
Shares repurchased during 2012 |  |  |  |  |  |  |  |  |  | 915,895

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