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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Comprehensive income      
Net earnings $ 103,856 $ 64,080 $ 364,400
Unrealized foreign currency translation adjustment, net of tax 1,372 978 179
Pension and other benefit adjustments:      
Net gain (loss) arising during the period, net of tax 166 (13,543) 4,510
Prior service credit arising during the period, net of tax 746   9,271
Amortization of net (gain) loss reclassified into general and administrative: other, net of tax (1,679) (844) (78)
Amortization of prior service credit reclassified into general and administrative: other, net of tax (1,762) (1,016)  
Curtailment gain reclassified into general and administrative: other, net of tax (7,239)    
Settlement gain reclassified into general and administrative: other, net of tax (196)    
Marketable securities:      
Unrealized net holding gain (loss) arising during the period, net of tax (1,056) 2,627 (1,622)
Realized net (gain) loss reclassified into investment expense (income), net of tax (156) (31) 925
Equity method investees' cash flow hedge:      
Unrealized net holding gain (loss) arising during the period, net of tax (693) (59) 2,085
Realized net (gain) loss reclassified into equity in earnings of non-consolidated entities, net of tax 457 528 (510)
Other comprehensive income (loss) (10,040) (11,360) 14,760
Total comprehensive income $ 93,816 $ 52,720 $ 379,160