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Consolidated Statements of Comprehensive Income (Loss) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Statement Of Income And Comprehensive Income [Abstract]      
Consolidated net income (loss) $ 56,602 $ 72,253 $ 286,610
Other comprehensive income (loss), net of tax:      
Foreign currency translation adjustments 6,457 (86) (13,543)
Benefit plans (1,840) (12,928)  
Total other comprehensive income (loss), net of tax 4,617 (13,014) (13,543)
Comprehensive income (loss) 61,219 59,239 273,067
Less: Comprehensive income (loss) from continuing operations attributable to noncontrolling interest in subsidiaries, net of tax 8,139 20,314 29,436
Less: Comprehensive income (loss) from discontinued operations attributable to noncontrolling interest in subsidiaries, net of tax     53,121
Less: Comprehensive income (loss) attributable to noncontrolling interest in subsidiaries, net of tax 8,139 20,314 82,557
Comprehensive income (loss) attributable to common stockholders $ 53,080 $ 38,925 $ 190,510