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Variable Interest Entity (Tables)
12 Months Ended
Dec. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Schedule of Fair Value and Carrying Value of Assets and Liabilities
The following table summarizes the carrying amounts of assets and liabilities as of December 31, 2021 and 2020 for KFPC before intercompany eliminations. See Note 8 Long Term Debt, for further discussion related to the KFPC Loan Agreement executed on July 17, 2014. 
 December 31, 2021December 31, 2020
 (In thousands)
Cash and cash equivalents$9,890 $3,097 
Other current assets14,814 17,304 
Property, plant, and equipment142,790 150,838 
Intangible assets7,355 7,959 
Long-term operating lease assets, net6,938 7,178 
Other long-term assets2,683 6,510 
Total assets$184,470 $192,886 
Current portion of long-term debt$67,726 $72,156 
Current liabilities8,273 5,209 
Long-term debt— 17,559 
Deferred income taxes675 1,984 
Long-term operating lease liabilities6,445 6,700 
Total liabilities$83,119 $103,608