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Debt (Details 2) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2015
Jul. 22, 2015
Jul. 21, 2015
Operating Partnership | LIBOR | Adjusted LIBOR Rate Loans and Letter of Credit | Consolidated Leverage Ratio, 35%      
Debt      
Consolidated leverage ratio, maximum (as a percent) 35.00%    
Variable rate basis LIBOR    
Reference rate (as a percent) 1.50%    
Operating Partnership | LIBOR | Adjusted LIBOR Rate Loans and Letter of Credit | Consolidated Leverage Ratio, >35% and 45%      
Debt      
Consolidated leverage ratio, minimum (as a percent) 35.00%    
Consolidated leverage ratio, maximum (as a percent) 45.00%    
Variable rate basis LIBOR    
Reference rate (as a percent) 1.65%    
Operating Partnership | LIBOR | Adjusted LIBOR Rate Loans and Letter of Credit | Consolidated Leverage Ratio, >45% and 45%      
Debt      
Consolidated leverage ratio, minimum (as a percent) 45.00%    
Consolidated leverage ratio, maximum (as a percent) 45.00%    
Variable rate basis LIBOR    
Reference rate (as a percent) 1.75%    
Operating Partnership | LIBOR | Adjusted LIBOR Rate Loans and Letter of Credit | Consolidated Leverage Ratio, >45% and 50%      
Debt      
Consolidated leverage ratio, minimum (as a percent) 45.00%    
Consolidated leverage ratio, maximum (as a percent) 50.00%    
Variable rate basis LIBOR    
Reference rate (as a percent) 1.85%    
Operating Partnership | LIBOR | Adjusted LIBOR Rate Loans and Letter of Credit | Consolidated Leverage Ratio, >50% and 55%      
Debt      
Consolidated leverage ratio, minimum (as a percent) 50.00%    
Consolidated leverage ratio, maximum (as a percent) 55.00%    
Variable rate basis LIBOR    
Reference rate (as a percent) 2.00%    
Operating Partnership | LIBOR | Adjusted LIBOR Rate Loans and Letter of Credit | Consolidated Leverage Ratio, >55%      
Debt      
Consolidated leverage ratio, minimum (as a percent) 55.00%    
Variable rate basis LIBOR    
Reference rate (as a percent) 2.20%    
Operating Partnership | Base Rate | Base Rate Loans | Consolidated Leverage Ratio, 35%      
Debt      
Reference rate (as a percent) 0.50%    
Operating Partnership | Base Rate | Base Rate Loans | Consolidated Leverage Ratio, >35% and 45%      
Debt      
Reference rate (as a percent) 0.65%    
Operating Partnership | Base Rate | Base Rate Loans | Consolidated Leverage Ratio, >45% and 45%      
Debt      
Reference rate (as a percent) 0.75%    
Operating Partnership | Base Rate | Base Rate Loans | Consolidated Leverage Ratio, >45% and 50%      
Debt      
Reference rate (as a percent) 0.85%    
Operating Partnership | Base Rate | Base Rate Loans | Consolidated Leverage Ratio, >50% and 55%      
Debt      
Reference rate (as a percent) 1.00%    
Operating Partnership | Base Rate | Base Rate Loans | Consolidated Leverage Ratio, >55%      
Debt      
Reference rate (as a percent) 1.20%    
Credit Agreement      
Debt      
Maximum borrowing capacity $ 400.0    
Amount outstanding 191.0    
Current borrowing capacity 136.7    
Remaining borrowing capacity $ 72.3    
Credit Agreement | LIBOR      
Debt      
Reference rate (as a percent) 1.50%    
Credit Agreement | Operating Partnership      
Debt      
Maximum borrowing capacity   $ 750.0 $ 400.0
Term of extension option 1 year    
Increase in maximum borrowing capacity   350.0  
Maximum borrowing capacity under accordion feature   $ 1,100.0  
Interest rate at end of period (as a percent) 1.69%    
Credit Agreement | Operating Partnership | Swingline loan      
Debt      
Maximum borrowing capacity as a percentage of maximum principal amount   10.00%  
Minimum | Credit Agreement | Operating Partnership      
Debt      
Unused fee (as a percent) 0.15%    
Minimum | Credit Agreement | Operating Partnership | LIBOR      
Debt      
Reference rate (as a percent) 1.50%    
Maximum | Credit Agreement | Operating Partnership      
Debt      
Unused fee (as a percent) 0.25%    
Maximum | Credit Agreement | Operating Partnership | LIBOR      
Debt      
Reference rate (as a percent) 2.20%