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Debt:Term Loan (Details) - Term Loan Due 2026 [Member]
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2020
USD ($)
Integer9
Dec. 31, 2016
USD ($)
Mar. 30, 2016
USD ($)
Debt Instrument [Line Items]      
Debt Instrument, Face Amount     $ 75.0
Debt Instrument, Periodic Payment, Principal $ 10.0    
Debt Instrument, Date of First Required Payment Mar. 30, 2022    
Debt Instrument, Frequency of Periodic Payment annual    
Debt Instrument, Unused Borrowing Capacity, Amount   $ 30.0  
Repayments of Long-term Debt   $ 30.0  
Debt Instrument, Covenant, Capitalization Ratio, Maximum (as a percent) 60.00%    
Debt Instrument, Covenant, Consolidated Net Worth, Minimum $ 350.0    
Debt Instrument, Covenant, Available Liquidity, Minimum 100.0    
Threshold of amount of capital expenditures made during four consecutive quarters, maximum $ 50.0    
Number of Consecutive Quarters Within Which Maximum Threshold Amount Of Capital Expenditures Applies | Integer9 4    
Dividend restriction, interest coverage ratio (as a percent) 300.00%    
Dividend restriction, fixed-charge coverage ratio (as a percent) 100.00%    
Debt Instrument, Interest Rate During Period 3.55%    
Debt Instrument, Interest Rate During Period With Patronage Credits 2.50%    
London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]      
Debt Instrument [Line Items]      
Basis spread on variable interest rate 1.875%    
London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member]      
Debt Instrument [Line Items]      
Basis spread on variable interest rate 2.125%    
Base Rate [Member] | Minimum [Member]      
Debt Instrument [Line Items]      
Basis spread on variable interest rate 0.875%    
Base Rate [Member] | Maximum [Member]      
Debt Instrument [Line Items]      
Basis spread on variable interest rate 1.125%