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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 | Dec. 31, 2016
Equity, Class of Treasury Stock [Line Items] |  |  |
Treasury Stock, Value | $ 105,379 |  | $ 104,860
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 |  |
Seventy Millions Repurchase Program [Member] |  |  |
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 | $ 8,925 |  |

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- Definition Total cost of shares repurchased divided by the total number of shares repurchased. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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