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Shareholders' Equity (Details textual) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 6 Months Ended
Mar. 06, 2015
Jun. 30, 2015
Jun. 30, 2015
Feb. 05, 2015
Stockholders Equity Note [Line Items]        
Common stock authorized to be repurchased, number of shares (in shares)       15.0
Common stock repurchased, shares   1.0    
Common stock dividends, paid per share (in dollars per share) $ 0.11      
Retained Earnings        
Stockholders Equity Note [Line Items]        
Common stock dividends, total cash paid     $ 30.8