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Debt:Term Loan (Details)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2020
USD ($)
Integer9
Jun. 30, 2019
USD ($)
Dec. 31, 2016
USD ($)
Mar. 30, 2016
USD ($)
Debt Instrument [Line Items]        
Repayments of Long-term Debt $ 0 $ 5,500    
Term Loan Due 2026 [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Face Amount       $ 75,000
Debt Instrument, Periodic Payment, Principal $ 10,000      
Debt Instrument, Date of First Required Payment Mar. 30, 2022      
Debt Instrument, Frequency of Periodic Payment annual      
Debt Instrument, Unused Borrowing Capacity, Amount     $ 30,000  
Repayments of Long-term Debt     $ 30,000  
Debt Instrument, Covenant, Capitalization Ratio, Maximum (as a percent) 60.00%      
Debt Instrument, Covenant, Consolidated Net Worth, Minimum $ 350,000      
Debt Instrument, Covenant, Available Liquidity, Minimum 100,000      
Threshold of amount of capital expenditures made during four consecutive quarters, maximum $ 50,000      
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 2.97%      
Debt Instrument, Interest Rate During Period With Patronage Credits 2.00%      
Term Loan Due 2026 [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]        
Debt Instrument [Line Items]        
Basis spread on variable interest rate 1.875%      
Term Loan Due 2026 [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member]        
Debt Instrument [Line Items]        
Basis spread on variable interest rate 2.125%      
Term Loan Due 2026 [Member] | Base Rate [Member] | Minimum [Member]        
Debt Instrument [Line Items]        
Basis spread on variable interest rate 0.875%      
Term Loan Due 2026 [Member] | Base Rate [Member] | Maximum [Member]        
Debt Instrument [Line Items]        
Basis spread on variable interest rate 1.125%