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CONDENSED CONSOLIDATING FINANCIAL INFORMATION - Statements of Comprehensive Income (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
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 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
Consolidating Adjustments      
Net earnings (92,381) (49,496) (348,044)
Equity in other comprehensive income (loss) of subsidiaries 9,488 10,628 (14,201)
Equity method investees' cash flow hedge:      
Other comprehensive income (loss) 9,488 10,628 (14,201)
Total comprehensive income (82,893) (38,868) (362,245)
AMCE      
Net earnings 103,856 64,080 364,400
Equity in other comprehensive income (loss) of subsidiaries (10,040) (11,360) 14,760
Equity method investees' cash flow hedge:      
Other comprehensive income (loss) (10,040) (11,360) 14,760
Total comprehensive income 93,816 52,720 379,160
Subsidiary Guarantors      
Net earnings 93,375 51,401 349,185
Equity in other comprehensive income (loss) of subsidiaries 552 732 (559)
Unrealized foreign currency translation adjustment, net of tax 820 246 738
Pension and other benefit adjustments:      
Net 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 83,335 40,041 363,945
Subsidiary Non-Guarantors      
Net earnings (994) (1,905) (1,141)
Unrealized foreign currency translation adjustment, net of tax 552 732 (559)
Equity method investees' cash flow hedge:      
Other comprehensive income (loss) 552 732 (559)
Total comprehensive income $ (442) $ (1,173) $ (1,700)