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Consolidated Statements Of Comprehensive Income (Loss) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Statement of Comprehensive Income [Abstract]        
Net income (loss) $ 11,196,000 $ 14,477,000 $ (11,126,000) $ 34,261,000
Other comprehensive income (loss):        
Foreign currency translation adjustment (474,000) 507,000 (12,003,000) (283,000)
Derivative financial instruments adjustment 1,258,000 621,000 (2,517,000) 268,000
Amortization of prior service costs and net gains or losses 2,931,000 2,079,000 5,862,000 4,158,000
Other comprehensive income (loss) 3,715,000 3,207,000 (8,658,000) 4,143,000
Comprehensive income (loss) 14,911,000 17,684,000 (19,784,000) 38,404,000
Foreign currency translation adjustment, tax (benefit) 177,000 0 1,106,000 0
Derivative financial instruments adjustment, tax (benefit) (339,000) 134,000 (887,000) 51,000
Amortization of prior service costs and net gains or losses, tax $ 835,000 $ 593,000 $ 1,671,000 $ 1,185,000