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Share Based Compensation (Details)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2013
Service-Based Share Awards [Member]
Dec. 31, 2012
Service-Based Share Awards [Member]
Dec. 31, 2013
1996 Stock Option Plan [Member]
Dec. 31, 2013
1996 Stock Option Plan [Member]
Non-employee director [Member]
Dec. 31, 2013
1996 Stock Option Plan [Member]
Grant date [Member]
Dec. 31, 2013
1996 Stock Option Plan [Member]
Anniversary date [Member]
Dec. 31, 2013
Non-Employee Directors Stock Option Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Stock Incentive Plan, shares authorized (in Shares)         10,000,000        
Stock Incentive Plan, shares remaining (in Shares)         7,190,000        
Stock Incentive Plan, expected term (years)         10 years        
Stock Incentive Plan, vesting rights             one-third one-third  
Service-based share awards, vesting rights         3 years 12 months      
Options to purchase common stock (in Shares)   626,334     619,833        
Service-based share awards outstanding (in Shares)     442,737 396,133          
Time-vested performance share units, authorized (in Shares)         219,381        
Outstanding options (in Shares) 619,833 [1]               9,000
[1] As explained above, all unvested stock options immediately vested and became immediately exercisable in 2011. All such options will remain exercisable for their respective remaining term, regardless of whether the awardees remain employees of Century.