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Acquisition Level 3 (Tables)
12 Months Ended
Dec. 31, 2020
Business Combination, Separately Recognized Transactions [Line Items]  
Gains (Losses) on Divestitures and Impairment Charges [Table Text Block]
Years Ended December 31,
202020192018
 (In thousands)
Gains on divestitures, net$11,962 $41,835 $20,340 
Impairment losses(4,953)(8,916)(4,407)
Gains on divestitures and impairment charges, net$7,009 $32,919 $15,933