Shareholders' Equity and Stock Options (Details Textual) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended			12 Months Ended
	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