Quarterly report pursuant to Section 13 or 15(d)

Note 3 - Fair Value Measurements - Carrying Value and Fair Value of Long-term Debt (Details)

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Note 3 - Fair Value Measurements - Carrying Value and Fair Value of Long-term Debt (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Long-term Debt, Total $ 624,222 $ 719,533
Credit Agreement [Member]    
Long-term Debt, Total 80,000 105,000
Long-term debt, fair value 80,000 105,000
Senior Second Lien Notes Due November 2023 [Member]    
Long-term Debt, Total 544,222 614,533
Long-term debt, fair value $ 346,862 $ 597,188