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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Statement Of Other Comprehensive Income [Abstract]      
NET INCOME (LOSS) $ 175,402 $ 162,511 $ (141,246)
OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAXES:      
Pension adjustment (1,408) 1,033 (788)
Foreign currency translation (621) 391 652
Unrealized (loss) gain on securities, net reclassification adjustments   (24) 3
COMPREHENSIVE INCOME (LOSS) $ 173,373 $ 163,911 $ (141,379)