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CONDENSED CONSOLIDATING FINANCIAL INFORMATION (Details 2) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Condensed consolidated financial information        
Net earnings (loss) $ 31,393 $ 61,576 $ 26,885 $ 51,318
Foreign currency translation adjustment, net of tax (599) 331 (433) 1,965
Pension and other benefit adjustments:        
Amortization of net gains included in net periodic benefit costs, net of tax (210) (19) (421) (38)
Amortization of prior service credit included in net periodic benefit costs, net of tax (254)   (508)  
Unrealized gains on marketable securities:        
Unrealized holding gains arising during the period, net of tax 1,340 1,147 3,359 3,501
Less: reclassification adjustment for gains included in investment expense (income), net of tax (11) (13) (15) (21)
Unrealized gains from equity method investees' cash flow hedge:        
Unrealized holding gains (losses) arising during the period, net of tax (240) 2,175 (272) 2,468
Holding (gains) losses reclassified to equity in earnings of non-consolidated entities, net of tax 132 (247) 263 (247)
Other comprehensive income 158 3,374 1,973 7,628
Total comprehensive income 31,551 64,950 28,858 58,946
Consolidating Adjustments
        
Condensed consolidated financial information        
Net earnings (loss) (27,742) (57,841) (19,320) (43,299)
Equity in other comprehensive income (loss) of subsidiaries 189 (3,287) (1,539) (8,961)
Unrealized gains from equity method investees' cash flow hedge:        
Other comprehensive income 189 (3,287) (1,539) (8,961)
Total comprehensive income (27,553) (61,128) (20,859) (52,260)
AMCE | Reportable Entity
        
Condensed consolidated financial information        
Net earnings (loss) 31,393 61,576 26,885 51,318
Equity in other comprehensive income (loss) of subsidiaries 158 3,374 1,973 7,628
Unrealized gains from equity method investees' cash flow hedge:        
Other comprehensive income 158 3,374 1,973 7,628
Total comprehensive income 31,551 64,950 28,858 58,946
Subsidiary Guarantors | Reportable Entity
        
Condensed consolidated financial information        
Net earnings (loss) 28,261 57,888 20,293 43,517
Equity in other comprehensive income (loss) of subsidiaries (347) (87) (434) 1,333
Foreign currency translation adjustment, net of tax (252) 418 1 632
Pension and other benefit adjustments:        
Amortization of net gains included in net periodic benefit costs, net of tax (210) (19) (421) (38)
Amortization of prior service credit included in net periodic benefit costs, net of tax (254)   (508)  
Unrealized gains on marketable securities:        
Unrealized holding gains arising during the period, net of tax 1,340 1,147 3,359 3,501
Less: reclassification adjustment for gains included in investment expense (income), net of tax (11) (13) (15) (21)
Unrealized gains from equity method investees' cash flow hedge:        
Unrealized holding gains (losses) arising during the period, net of tax (240) 2,175 (272) 2,468
Holding (gains) losses reclassified to equity in earnings of non-consolidated entities, net of tax 132 (247) 263 (247)
Other comprehensive income 158 3,374 1,973 7,628
Total comprehensive income 28,419 61,262 22,266 51,145
Subsidiary Non-Guarantors | Reportable Entity
        
Condensed consolidated financial information        
Net earnings (loss) (519) (47) (973) (218)
Foreign currency translation adjustment, net of tax (347) (87) (434) 1,333
Unrealized gains from equity method investees' cash flow hedge:        
Other comprehensive income (347) (87) (434) 1,333
Total comprehensive income $ (866) $ (134) $ (1,407) $ 1,115