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Debt:Term Loan (Details)
$ in Thousands
6 Months Ended 11 Months Ended 12 Months Ended
Jun. 30, 2019
USD ($)
Integer9
Jun. 30, 2018
USD ($)
Nov. 30, 2018
Dec. 31, 2016
USD ($)
Mar. 30, 2016
USD ($)
Debt Instrument [Line Items]          
Repayments of Long-term Debt $ 5,500 $ 7,500      
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  
Debt Instrument, Unused Borrowing Capacity, Fee (as a percentage)     0.325%    
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 4.36%        
Debt Instrument, Interest Rate During Period With Patronage Credits 3.40%        
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%