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DEBT - DESCRIPTION (Details)
$ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Jul. 30, 2015
USD ($)
Jul. 31, 2015
USD ($)
Jan. 31, 2014
USD ($)
Jun. 30, 2012
USD ($)
tranche
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
Sep. 30, 2013
USD ($)
Debt                
Letters of credit         $ 11.0      
Debt maturities                
2016         22.0      
2017         31.0      
2018         30.6      
2019         30.0      
2020         30.0      
Thereafter         286.3      
Total Debt         429.9 $ 373.6    
Revolving Credit Facility                
Debt                
Long-term Line of Credit         0.0 $ 0.0    
Debt instrument term       5 years        
Maximum borrowing capacity $ 400.0     $ 375.0        
Uncommitted option to increase credit facility $ 150.0     75.0        
Unused portion of credit facility         $ 389.0      
Interest rate applicable to any borrowings         1.40%      
Revolving Credit Facility | Extension of maturity                
Debt                
Debt instrument term 5 years              
Revolving Credit Facility | Minimum                
Debt                
Ratio of consolidated EBITDA to interest expense         0.0350      
Credit facility commitment fee percentage         0.15%      
Revolving Credit Facility | Minimum | London Interbank Offered Rate (LIBOR)                
Debt                
Variable rate margin         1.00%      
Revolving Credit Facility | Minimum | Base rate                
Debt                
Variable rate margin         0.00%      
Revolving Credit Facility | Maximum                
Debt                
Debt covenant, required ratio of debt to consolidated EBITDA         0.0325      
Debt covenant, required principal amount of priority debt as a percentage of consolidated tangible assets         20.00%      
Debt covenant, required principal amount of priority debt (excluding Title XI) as a percentage of consolidated tangible assets         10.00%      
Credit facility commitment fee percentage         0.30%      
Revolving Credit Facility | Maximum | London Interbank Offered Rate (LIBOR)                
Debt                
Variable rate margin         1.75%      
Revolving Credit Facility | Maximum | Base rate                
Debt                
Variable rate margin         0.75%      
Standby and commercial letters of credit                
Debt                
Maximum borrowing capacity       100.0        
Letters of credit         $ 11.0      
Standby and commercial letters of credit | Minimum                
Debt                
Line of credit fees percentage         1.00%      
Standby and commercial letters of credit | Maximum                
Debt                
Line of credit fees percentage         1.75%      
Swing Line Loans                
Debt                
Maximum borrowing capacity       50.0        
5.34%, payable through 2028                
Debt                
Debt issued               $ 55.0
Interest rate (as a percent)         5.34% 5.34% 5.34%  
Semi-annual payments           $ 1.1    
Debt maturities                
Total Debt         $ 28.6 $ 30.8    
5.79%, payable through 2020                
Debt                
Interest rate (as a percent)         5.79% 5.79% 5.79%  
Annual principal payments         $ 3.5      
Debt maturities                
Total Debt         31.5 $ 38.5    
5.27%, payable through 2029                
Debt                
Debt issued         $ 55.0      
Interest rate (as a percent)         5.27% 5.27% 5.27%  
Semi-annual payments           $ 1.1    
Debt maturities                
Total Debt         $ 30.8 $ 33.0    
Senior Unsecured Long Term Debt                
Debt                
Debt issued     $ 100.0          
Debt instrument term     30 years          
Weighted average period     14 years 6 months          
Interest rate (as a percent)     4.35%          
Senior Unsecured Long Term Debt | Debt Instrument Redemption 2021                
Debt                
Annual principal payments     $ 5.0          
Senior Unsecured Long Term Debt | Debt Instrument Redemption 2022 and 2023                
Debt                
Annual principal payments     7.5          
Senior Unsecured Long Term Debt | Debt Instrument Redemption 2024 to 2027                
Debt                
Annual principal payments     10.0          
Senior Unsecured Long Term Debt | Debt Instrument Redemption 2028                
Debt                
Annual principal payments     8.0          
Senior Unsecured Long Term Debt | Debt Instrument Redemption 2029 and thereafter until 2044                
Debt                
Annual principal payments     $ 2.0          
4.35%, payable through 2044                
Debt                
Interest rate (as a percent)         4.35% 4.35%    
Debt maturities                
Total Debt         $ 100.0 $ 100.0    
Unsecured debt                
Debt                
Debt issued       $ 170.0        
Weighted average coupon rate (as a percent)       3.97%        
Weighted average period       9 years 2 months 12 days        
Number of tranches | tranche       3        
Unsecured debt | Debt Instrument Redemption 2015 through 2016                
Debt                
Semi-annual payments       $ 4.6        
Unsecured debt | Debt Instrument Redemption 2017 through mid-year 2023                
Debt                
Semi-annual payments       8.4        
Unsecured debt | Debt Instrument Redemption Mid-year 2023 through mid-year 2027                
Debt                
Semi-annual payments       3.8        
Unsecured debt | Debt Instrument Redemption 2017 through 2019                
Debt                
Semi-annual payments       1.2        
Unsecured debt, tranche maturing in 2023                
Debt                
Debt issued       $ 77.5        
Interest rate (as a percent)       3.66%        
Unsecured debt, tranche maturing in 2027                
Debt                
Debt issued       $ 55.0        
Interest rate (as a percent)       4.16%        
Unsecured debt, tranche maturing in 2032                
Debt                
Debt issued       $ 37.5        
Interest rate (as a percent)       4.31%        
Notes 30 years                
Debt                
Debt issued   $ 75.0            
Debt instrument term   30 years            
Weighted average period   13 years            
Interest rate (as a percent)   3.92%            
Notes 30 years | Debt Instrument Redemption After 2026                
Debt                
Annual principal payments   $ 1.5            
Notes 30 years | Debt Instrument Redemption 2017 through 2019                
Debt                
Annual principal payments   1.8            
Notes 30 years | Minimum | Debt Instrument Redemption 2020 through 2026                
Debt                
Annual principal payments   1.3            
Notes 30 years | Maximum | Debt Instrument Redemption 2020 through 2026                
Debt                
Annual principal payments   $ 8.0            
Title XI Notes | Financial Guarantee                
Debt maturities                
Total Debt         $ 59.4