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Stockholders' Equity (Shares repurchased under the stock repurchase program) (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014
Equity, Class of Treasury Stock [Line Items] |  |
Common shares repurchased as part of the stock repurchase program (Shares) | 803,985 | 1,153,998
Treasury Stock Acquired, Average Cost Per Share | $ 11.1 | $ 14.66
Treasury Stock, Value | $ 105,379 | $ 97,070
January 2014 [Member] |  |
Equity, Class of Treasury Stock [Line Items] |  |
Common shares repurchased as part of the stock repurchase program (Shares) |  | 57,700
Treasury Stock Acquired, Average Cost Per Share |  | $ 14.73
Treasury Stock, Value |  | $ 850
February 2014 [Member] |  |
Equity, Class of Treasury Stock [Line Items] |  |
Common shares repurchased as part of the stock repurchase program (Shares) |  | 649,700
Treasury Stock Acquired, Average Cost Per Share |  | $ 14.66
Treasury Stock, Value |  | $ 9,522
April 2015 [Member] |  |
Equity, Class of Treasury Stock [Line Items] |  |
Common shares repurchased as part of the stock repurchase program (Shares) | 204,338 |
Treasury Stock Acquired, Average Cost Per Share | $ 14.38 |
Treasury Stock, Value | $ 2,939 |
May 2015 [Member] |  |
Equity, Class of Treasury Stock [Line Items] |  |
Common shares repurchased as part of the stock repurchase program (Shares) | 48,200 |
Treasury Stock Acquired, Average Cost Per Share | $ 13.09 |
Treasury Stock, Value | $ 631 |
June 2015 [Member] |  |
Equity, Class of Treasury Stock [Line Items] |  |
Common shares repurchased as part of the stock repurchase program (Shares) | 51,447 |
Treasury Stock Acquired, Average Cost Per Share | $ 12.81 |
Treasury Stock, Value | $ 659 |
July 2015 [Member] |  |
Equity, Class of Treasury Stock [Line Items] |  |
Common shares repurchased as part of the stock repurchase program (Shares) | 500,000 |
Treasury Stock Acquired, Average Cost Per Share | $ 9.39 |
Treasury Stock, Value | $ 4,696 |
August 2014 [Member] |  |
Equity, Class of Treasury Stock [Line Items] |  |
Common shares repurchased as part of the stock repurchase program (Shares) |  | 100
Treasury Stock Acquired, Average Cost Per Share |  | $ 15.5
Treasury Stock, Value |  | $ 2
November 2014 [Member] |  |
Equity, Class of Treasury Stock [Line Items] |  |
Common shares repurchased as part of the stock repurchase program (Shares) |  | 63,100
Treasury Stock Acquired, Average Cost Per Share |  | $ 14.69
Treasury Stock, Value |  | $ 927
December 2014 [Member] |  |
Equity, Class of Treasury Stock [Line Items] |  |
Common shares repurchased as part of the stock repurchase program (Shares) |  | 1,885
Treasury Stock Acquired, Average Cost Per Share |  | $ 14.7
Treasury Stock, Value |  | $ 28
October 2014 [Member] |  |
Equity, Class of Treasury Stock [Line Items] |  |
Common shares repurchased as part of the stock repurchase program (Shares) |  | 381,513
Treasury Stock Acquired, Average Cost Per Share |  | $ 14.64
Treasury Stock, Value |  | $ 5,585

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