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, 2019
Dec. 31, 2018
Long-term debt, carrying value $ 634,415 $ 633,535
Credit Agreement [Member]    
Long-term debt, carrying value 21,000 21,000
Long-term debt, fair value 21,000 21,000
Senior Second Lien Notes Due November 2023 [Member]    
Long-term debt, carrying value 613,415 612,535
Long-term debt, fair value $ 594,725 $ 546,875