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Debt (Narrative) (Details)
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Apr. 18, 2013
USD ($)
extensions
May. 31, 2015
USD ($)
Mar. 31, 2015
USD ($)
May. 31, 2010
USD ($)
Sep. 30, 2014
USD ($)
Jun. 30, 2015
USD ($)
Dec. 31, 2014
USD ($)
Debt Instrument [Line Items]              
Debt service guaranty liability           $ 72,105,000 $ 72,105,000
Debt stated interest rate           3.50% 7.40%
Medium term notes, matured           $ 90,000,000 $ 315,000,000
Debt interest rate during period           5.40% 5.20%
Secured debt           $ 66,000,000  
Write off of debt costs         $ 1,200,000    
Debt instruments collateral value           800,000,000 $ 1,000,000,000
Unsecured notes payable under credit facilities           73,000,000 189,000,000
Obligations under capital leases           21,000,000 21,000,000
Fair value of interest rate contracts           3,500,000  
Net premium/(discount) on debt           (4,800,000)  
Non-cash debt           $ 4,000,000  
Unsecured Revolving Credit Facility [Member]              
Debt Instrument [Line Items]              
Maximum borrowing capacity under credit facility $ 500,000,000            
Number of credit facility 6-month extensions | extensions 2            
Line of credit facility, extension period 6 months            
Borrowing margin over LIBOR, basis points           1.15%  
Facility fees, basis points           0.20%  
Bids amount $ 250,000,000            
Maximum increase in credit facility amount $ 700,000,000            
Unsecured notes payable under credit facilities           $ 63,000,000 $ 189,000,000
Unsecured And Uncommitted Overnight Facility [Member]              
Debt Instrument [Line Items]              
Maximum borrowing capacity under credit facility       $ 99,000,000      
Fixed interest rate loan period (in days)       30 days      
Debt Service Guaranty [Member]              
Debt Instrument [Line Items]              
Debt coverage ratio           1.4  
Term Loan [Member]              
Debt Instrument [Line Items]              
Debt payable     $ 200,000,000        
Debt effective percentage     2.60%        
Maximum increase in term loan amount     $ 100,000,000        
Short-Term Unsecured Facility [Member] | Line of Credit [Member]              
Debt Instrument [Line Items]              
Maximum borrowing capacity under credit facility     $ 20,000,000        
Facility fees, basis points     0.10%        
Fixed interest rate loan period (in days)     30 days        
3.85% Senior Unsecured Notes [Member] | Senior Notes [Member]              
Debt Instrument [Line Items]              
Debt payable   $ 250,000,000          
Debt stated interest rate   3.85%          
Debt instrument, issued discount   99.23%          
Debt effective percentage   3.94%          
Proceeds from issuance of long-term debt   $ 246,500,000          
8.1% Senior Unsecured Notes [Member]              
Debt Instrument [Line Items]              
Debt stated interest rate             8.10%
Senior unsecured notes             $ 100,000,000
Debt redemption price, percentage             100.00%
Thirty-Day LIBOR [Member] | Short-Term Unsecured Facility [Member] | Line of Credit [Member]              
Debt Instrument [Line Items]              
Borrowing margin over LIBOR, basis points     1.25%        
London Interbank Offered Rate (LIBOR) [Member] | Term Loan [Member]              
Debt Instrument [Line Items]              
Borrowing margin over LIBOR, basis points     1.15%        
Interest Expense [Member]              
Debt Instrument [Line Items]              
Payments of debt extinguishment costs           $ 6,100,000