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Shareholders' Equity (Shares Issued and Outstanding) (Details) - shares
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Shares issued - January 1 (in shares) 38,441,972    
Shares outstanding - January 1 (in shares) 38,441,972    
Issuance of shares 7,435,000 0 0
Shares issued - December 31 (in shares) 43,701,064 38,441,972  
Shares outstanding - December 31 (in shares) 43,701,064 38,441,972  
Common stock      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Shares issued - January 1 (in shares) 38,442,000 43,646,000 45,542,000
Shares outstanding - January 1 (in shares) 38,442,000 43,646,000 45,542,000
Repurchase of shares (2,473,000) (5,355,000) (2,451,000)
Exercise of options and issuance of restricted stock awards 297,000 151,000 555,000
Shares issued - December 31 (in shares) 43,701,000 38,442,000 43,646,000
Shares outstanding - December 31 (in shares) 43,701,000 38,442,000 43,646,000