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Debt Including Capital Lease Obligations (Narratives) (Details)
6 Months Ended
May 13, 2016
USD ($)
May 09, 2016
USD ($)
Mar. 07, 2016
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2015
USD ($)
Mar. 07, 2016
EUR (€)
Mar. 07, 2016
USD ($)
Line of Credit Facility              
Proceeds from lines of credit       $ 190,000,000 $ 0    
Restricted cash and cash equivalents $ 68,900,000            
Capital lease obligations 80,000,000            
Deferred finance cost       3,500,000 $ 0    
Affiliated Entity              
Line of Credit Facility              
Payments of distributions to affiliates 448,500,000            
Line of Credit              
Line of Credit Facility              
Letters of credit outstanding, amount       3,400,000      
Letter of credit remaining amount       $ 206,600,000      
Line of Credit | Facilities              
Line of Credit Facility              
Deferred finance cost     $ 3,600,000        
Line of Credit | Facilities | Maximum              
Line of Credit Facility              
Unused capacity fee (percentage)       0.30%      
Line of Credit | Revolving Credit Facility              
Line of Credit Facility              
Line of credit maximum borrowing amount             $ 400,000,000
Proceeds from lines of credit $ 200,000,000            
Line of Credit | Sub-facility              
Line of Credit Facility              
Line of credit maximum borrowing amount | €           € 100,000,000  
Line of Credit | Sub limit              
Line of Credit Facility              
Line of credit maximum borrowing amount             75,000,000
Line of Credit | Swing line              
Line of Credit Facility              
Line of credit maximum borrowing amount             40,000,000
Senior Notes | Facilities              
Line of Credit Facility              
Debt instrument, face amount             $ 300,000,000
Potential leverage ratio       4.25      
Senior Notes | Facilities | Minimum              
Line of Credit Facility              
Unused capacity fee (percentage)       0.15%      
Leverage ratio       3.00      
Senior Notes | Facilities | Minimum | LIBOR              
Line of Credit Facility              
Debt instrument, basis spread on variable rate       1.25%      
Senior Notes | Facilities | Minimum | Base Rate              
Line of Credit Facility              
Debt instrument, basis spread on variable rate       0.25%      
Senior Notes | Facilities | Maximum              
Line of Credit Facility              
Leverage ratio       3.75      
Senior Notes | Facilities | Maximum | LIBOR              
Line of Credit Facility              
Debt instrument, basis spread on variable rate       2.00%      
Senior Notes | Facilities | Maximum | Base Rate              
Line of Credit Facility              
Debt instrument, basis spread on variable rate       1.00%      
Senior Notes | Facilities | Year 1              
Line of Credit Facility              
Term facility amortization rate       0.00%      
Senior Notes | Facilities | Years 2-3              
Line of Credit Facility              
Term facility amortization rate       5.00%      
Senior Notes | Facilities | Years 4-5              
Line of Credit Facility              
Term facility amortization rate       10.00%      
Senior Notes | Term Loan Facility              
Line of Credit Facility              
Proceeds from issuance of senior long-term debt   $ 300,000,000          
Level 1 | Fair Value, Measurements, Recurring              
Line of Credit Facility              
Restricted investments, fair value       $ 70,200,000