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Stockholders' Equity (Shares repurchased under the stock repurchase program) (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Sep. 30, 2014
Equity, Class of Treasury Stock [Line Items]      
Common shares repurchased as part of the stock repurchase program (Shares) 803,985   707,500
Treasury Stock, Value $ 105,379 $ 97,070