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Debt -Term Loans, Medium Term Notes and Revenue Bonds - (Narrative) (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Jan. 31, 2019
Dec. 31, 2020
Dec. 31, 2009
Debt Instrument [Line Items]          
Proceeds from Issuance of Debt $ 46,000 $ 40,000      
Interest Rate 3.04% 3.17% 4.56% 3.04%  
Long-term Debt, refinancing amount     $ 150,000    
Debt instrument maturity date 2030 2029 2029    
Debt Instrument, outstanding amount including redemption premium     $ 4,900    
Debt Instrument, lender fee $ 1,857 $ 2,086 $ 500 $ 1,857  
Interest Rate Swaps [Member]          
Debt Instrument [Line Items]          
Long-term Debt, Gross 46,000 $ 40,000   46,000  
Amended Term Loan Agreement [Member]          
Debt Instrument [Line Items]          
Line of credit facility, amount outstanding $ 693,500     $ 693,500  
London Interbank Offered Rate (LIBOR) [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Basis Spread on Variable Rate 2.10% 1.85% 1.85% 1.00%  
Senior Notes [Member]          
Debt Instrument [Line Items]          
Proceeds from Issuance of Debt         $ 150,000
Interest Rate         7.50%