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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)      
Net (loss) income $ (87,111) $ 175,402 $ 162,511
OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAXES:      
Pension adjustment (5,030) (1,408) 1,033
Foreign currency translation 553 (621) 391
Unrealized loss on securities, net reclassification adjustments     (24)
COMPREHENSIVE (LOSS) INCOME $ (91,588) $ 173,373 $ 163,911