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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
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)      
Net income (loss) $ 109,493 $ (313,142) $ 104,222
Other comprehensive loss      
Foreign currency translation 91 (39) (9)
Unrealized gain on marketable securities, net of tax 203 1,615 504
Reclassification adjustment for realized loss on marketable securities     178
Defined benefit pension obligations, net of tax (696) (5,700) (2,750)
Other comprehensive loss (402) (4,124) (2,077)
Comprehensive income (loss) $ 109,091 $ (317,266) $ 102,145