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Stock Award Plans (Schedule Of Unvested Performance-Based Share Awards) (Details) (Performance-Based Share Awards [Member], USD $)
In Thousands, except Per Share data, unless otherwise specified
7 Months Ended 12 Months Ended
Dec. 31, 2010
Dec. 31, 2011
Performance-Based Share Awards [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares, Unvested service-based/performance-based share awards at beginning balance 0 1,168
Shares, Awarded 928  
Shares, Assumed 495  
Shares, Vested (224) (622)
Shares, Forfeited (31) (135)
Shares, Unvested service-based/performance-based share awards at ending balance 1,168 411
Weighted-Average Grant Date Fair Value, Unvested Service-based/Performance-based share awards at beginning balance $ 0.00 $ 17.20
Weighted-Average Grant Date Fair Value, Awarded $ 17.09  
Weighted-Average Grant Date Fair Value, Assumed $ 14.43  
Weighted-Average Grant Date Fair Value, Vested $ 15.06 $ 16.39
Weighted-Average Grant Date Fair Value, Forfeited $ 16.41 $ 16.77
Weighted-Average Grant Date Fair Value, Unvested Service-based/Performance-based share awards at ending balance $ 17.20 $ 16.95