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Long-Term Debt and Financing Obligations (Details)
$ in Thousands
Sep. 13, 2018
USD ($)
Sep. 12, 2018
Jun. 28, 2018
USD ($)
Debt Instrument [Line Items]      
Line of Credit Facility, Expiration Date Sep. 13, 2023 Jan. 14, 2020  
Line of Credit Facility, Current Borrowing Capacity $ 350,000    
Line of Credit Facility, Remaining Borrowing Capacity 50,000    
Line of Credit Facility, Maximum Borrowing Capacity $ 400,000    
Line of Credit Renewal Option, Renewal Times 2    
Line of Credit Renewal Term, Year 1 year    
Subfacility for the Issuance of Letters of Credit      
Debt Instrument [Line Items]      
Line of Credit Facility, Current Borrowing Capacity $ 50,000    
Senior Notes | 4.22% Senior Notes, due 2028      
Debt Instrument [Line Items]      
Debt Instrument, Issuance Date     Jun. 28, 2018
Debt Instrument, Face Amount     $ 125,000
Debt Instrument, Interest Rate, Stated Percentage     4.22%
Debt Instrument, Maturity Date     Aug. 15, 2028
Debt Instrument, Redemption Price, Percentage     100.00%
Senior Notes | 4.07% RGRT Senior Notes, due 2025      
Debt Instrument [Line Items]      
Debt Instrument, Issuance Date     Jun. 28, 2018
Debt Instrument, Face Amount     $ 65,000
Debt Instrument, Interest Rate, Stated Percentage     4.07%
Debt Instrument, Maturity Date     Aug. 15, 2025
Debt Instrument, Redemption Price, Percentage     100.00%