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Stock Option Plans and Share-Based Compensation Performance based stock units (PSU) (Details) (Performance Shares [Member], USD $)
12 Months Ended 9 Months Ended 12 Months Ended 0 Months Ended 9 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Sep. 30, 2013
2012 PSU [Member]
Dec. 31, 2013
2012 PSU [Member]
Dec. 31, 2012
2012 PSU [Member]
Mar. 05, 2013
2013 PSU [Member]
Sep. 30, 2013
2013 PSU [Member]
Number of units [Roll Forward]                
Beginning balance 175,000 100,000            
Granted 142,000 135,000 100,000     125,000 12,500 125,000
Share-based Compensation Arrangement by Share-based Payment Award, First Year Share Vesting Rate       25.00% 25.00%      
Vested 57,000 (60,000)            
Forfeited 35,000 0            
Ending balance 225,000 175,000 100,000          
Weighted-average grant date fair value per unit [Roll Forward]                
Beginning balance $ 11.00 $ 11.15            
Granted $ 14.68 $ 10.94            
Vested $ 11.15 $ 11.15            
Forfeited $ 10.93 $ 0.00            
Ending balance $ 13.32 $ 11.00 $ 11.15