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Note 8 - Debt (Details Textual)
$ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
Jun. 30, 2018
USD ($)
Mar. 31, 2020
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Mar. 23, 2020
USD ($)
Jan. 28, 2019
USD ($)
Jun. 27, 2018
USD ($)
Consolidated Total Leverage Ratio     4.05        
Consolidated Interest Coverage Ratio     4.24        
Long-term Debt, Total     $ 255,600        
Payments of Debt Issuance Costs     $ 358      
Amortization of Debt Issuance Costs     1,005 1,451      
Interest Expense, Long-term Debt, Total     15,900 16,800      
Interest Income, Other     $ 100 100      
Interest Rate Swap [Member]              
Derivative, Number of Instruments Held, Total     0        
Derivative, Notional Amount           $ 100,000  
Credit Agreement [Member]              
Line of Credit Facility, Maximum Borrowing Capacity Including Additional Lenders     $ 600,000        
Debt Instrument Covenant, Issued Qualified Senior Notes     $ 200,000        
Debt Instrument Covenant, Prior to Issuance of Qualified Senior Notes, Maximum Permitted Consolidated Total Leverage Ratio     5        
Debt Instrument Covenant, Prior to Issuance of Qualified Senior Notes, Based on Occurence of Acquisition, Maximum Permitted Consolidated Total Leverage Ratio     5.25        
Debt Instrument Covenant, Specified Acquisition, Aggregate Consideration     $ 15,000        
Debt Instrument Covenant, After Issuance of Qualified Senior Notes, Based on Occurence of Acquisition, Maximum Permitted Consolidated Total Leverage Ratio     5.5        
Debt Instrument Covenant, Maximum Permitted Consolidated Senior Secured Leverage Ratio     3.5        
Debt Instrument Covenant, Minimum Permitted Consolidated Interest Coverage Ratio     2.5        
Maximum Quarterly Distribution     $ 10,700        
Debt Instrument Covenant, Default, Percentage of General Partner Interest Cease     100.00%        
Write off of Deferred Debt Issuance Cost $ 400            
Payments of Debt Issuance Costs       400      
Amortization of Debt Issuance Costs     $ 1,000 $ 1,000      
Debt Instrument, Interest Rate During Period     6.00% 5.49%      
Credit Agreement [Member] | Ergon [Member]              
Debt Instrument Covenant, Default, Percentage of Membership Interest Cease     50.00%        
Credit Agreement [Member] | Forecast [Member]              
Debt Instrument Covenant, Prior to Issuance of Qualified Senior Notes, Maximum Permitted Consolidated Total Leverage Ratio   4.75          
Credit Agreement [Member] | Federal Funds Effective Rate [Member]              
Debt Instrument, Basis Spread on Variable Rate     0.50%        
Credit Agreement [Member] | Eurodollar Rate [Member]              
Debt Instrument, Basis Spread on Variable Rate     1.00%        
Credit Agreement [Member] | Minimum [Member]              
Line of Credit Facility, Commitment Fee Percentage     0.375%        
Credit Agreement [Member] | Minimum [Member] | Applicable Margin Based on Eurodollar Rate [Member]              
Debt Instrument, Basis Spread on Variable Rate     2.00%        
Credit Agreement [Member] | Minimum [Member] | Applicable Margin on Based on Alternate Base Rate [Member]              
Debt Instrument, Basis Spread on Variable Rate     1.00%        
Credit Agreement [Member] | Maximum [Member]              
Line of Credit Facility, Commitment Fee Percentage     0.50%        
Credit Agreement [Member] | Maximum [Member] | Applicable Margin Based on Eurodollar Rate [Member]              
Debt Instrument, Basis Spread on Variable Rate     3.25%        
Credit Agreement [Member] | Maximum [Member] | Applicable Margin on Based on Alternate Base Rate [Member]              
Debt Instrument, Basis Spread on Variable Rate     2.25%        
Credit Agreement [Member] | Subsequent Event [Member]              
Line of Credit Facility, Remaining Borrowing Capacity         $ 125,400    
Credit Agreement [Member] | Revolving Credit Facility [Member]              
Line of Credit Facility, Maximum Borrowing Capacity     $ 400,000       $ 450,000
Credit Agreement [Member] | Revolving Credit Facility [Member] | Subsequent Event [Member]              
Long-term Line of Credit, Total         273,600    
Credit Agreement [Member] | Letter of Credit [Member] | Subsequent Event [Member]              
Letters of Credit Outstanding, Amount         $ 1,000