Annual report pursuant to Section 13 and 15(d)

Equity - Based Compensation (Details)

v2.4.0.6
Equity - Based Compensation (Details) (Restricted Stock [Member], USD $)
In Thousands, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Restricted Stock [Member]
     
Summary of restricted activity [Abstract]      
Unvested shares at January 1, 2011, shares 2,070    
Granted, shares 1,124 1,200 1,100
Vested, shares (963) (800) (600)
Forfeited, shares (94)    
Unvested shares, shares 2,137 2,070  
Unvested, Weighted Average Grant Date Fair Value (Per share), Beginning of Period $ 20.68    
Granted, Weighted Average Grant Date Fair Value (Per share) $ 21.40 $ 19.20 $ 22.10
Vested, Weighted Average Grant Date Fair Value (Per share) $ 21.32    
Forfeited, Weighted Average Grant Date Fair Value (Per share) $ 20.69    
Unvested, Weighted Average Grant Date Fair Value (Per share), End of Period $ 20.77 $ 20.68