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Share-Based Compensation (Narrative) (Details) (USD $)
 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended
Jun. 30, 2011
Jan. 31, 2011
Jan. 31, 2010
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
2012 Plan [Member]
Dec. 31, 2011
2012 Plan [Member]
Jun. 15, 2012
2012 Plan [Member]
Jun. 30, 2011
Chief Executive Officer [Member]
Dec. 31, 2012
Chief Executive Officer [Member]
Dec. 31, 2012
2010 Grant Year [Member]
Dec. 31, 2012
2011 Grant Year [Member]
Jun. 30, 2011
Time-Based Awards [Member]
Jun. 30, 2011
Performance-Based Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Other time-based restricted shares issued         436,000 279,000       500,000 698,000        
Maximum number of shares to be granted per year to a participant       500,000     500,000                
Shares available for grant under a Stock Incentive Plan             2,400,000   4,500,000            
Aggregate cost of awards not yet recognized             $ 12,100,000                
Unrecognized cost recognition period             4 years 9 months 18 days                
Weighted-average grant date fair value per share       $ 4.68 [1] $ 5.40 $ 6.54         $ 4.75        
Fair value of vested shares       2,126,000 5,507,000 996,000                  
Accelerated vestings       $ 362,000 $ 1,980,000   $ 585,000 $ 3,569,000              
Number or grants vested 706,000                         284,000 422,000
Shares granted to Company's President         2,250,000         2,500,000          
Average annual TSR threshold                   6.50%          
Vesting period   3 years 3 years             7 years          
Appraisal value                   $ 4.39          
Grant date market price         $ 6.54 $ 6.70       $ 4.98          
Shares accounted for as equity award                   1,500,000          
Shares accounted for as liability award                   500,000          
Remaining performance-based awards after accelerated vestings                       73,000 100,000    
[1] Includes 2,250,000 shares granted to the Company's President and Chief Executive Officer in 2011, but not issued until 2012, as discussed below.