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Stock-Based Compensation Stock Based Compensation (Details) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Allocated Share-based Compensation Expense $ 619,000 $ 664,000 $ 2,000,000 $ 1,700,000
Restricted Stock [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period     261,973  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period     3 years  
Restricted Stock [Member] | Chief Executive Officer [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period     208,333  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period     3 years  
SNL RSUs [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period     162,783  
Payout Range Minimum     0.00%  
Payout Range Maximum     200.00%  
Share-based Compensation Arrangement by Share-based Payment Award, Vesting Date Feb. 15, 2015   Feb. 15, 2015  
Performance Period of Performance Based RSUs     January 1, 2012 to December 31, 2014  
Share-based Payment Arrangement by Award, Calculation of Payout per Unit     Average closing price on each day of trading during the 30-day vesting period ending December 31, 2014  
SNL RSUs [Member] | Chief Executive Officer [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period     281,532  
Payout Range Minimum     0.00%  
Payout Range Maximum     150.00%  
Performance Period of Performance Based RSUs     January 1, 2012 to December 31, 2016  
Interim Performance Measurement Dates     interim performance measurement dates at each of the third, fourth and fifth anniversaries  
Share-based Payment Arrangement by Award, Calculation of Payout per Unit     average closing price on each trading day during the 30-day period ending with such date  
FFO RSUs [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period     101,918  
Payout Range Minimum     0.00%  
Payout Range Maximum     200.00%  
Share-based Compensation Arrangement by Share-based Payment Award, Vesting Date Feb. 15, 2015   Feb. 15, 2015  
Performance Period of Performance Based RSUs     January 1, 2012 to December 31, 2014  
Share-based Payment Arrangement by Award, Calculation of Payout per Unit     Average closing price on each day of trading during the 30-day vesting period ending December 31, 2014