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Stock-Based Compensation Stock Based Compensation (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Allocated Share-based Compensation Expense $ 4.3 $ 0.1
Document Fiscal Year Focus 2016  
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 230,871  
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 212,102  
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 96,569  
Performance based Restricted Stock Unit [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Payout Range Minimum 0.00%  
Payout Range Maximum 200.00%  
Payout Per Unit Average Thirty Days Closing Price 30 days