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Shares - Antidilutive securities (Details)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Stock options
   
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Anti-dilutive awards not considered in computing diluted earnings per share 863,414 3,029,734
Stock awards
   
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Anti-dilutive awards not considered in computing diluted earnings per share   50,000