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INCOME TAXES (Details 2) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Deferred tax assets:    
Accrued expenses $ 50,311 $ 51,715
Pension liabilities 4,404 34,163
Postretirement liabilities other than pensions 6,349 7,127
Share-based compensation 5,898 6,034
Federal and state net operating loss carryforwards 9,840 14,071
Other 1,877 2,092
Total deferred tax assets 78,679 115,202
Valuation allowance (1,028) (2,511)
Total deferred tax assets, net of valuation allowance 77,651 112,691
Deferred tax liabilities:    
Amortization, depreciation, and basis differences for property, plant and equipment and other long-lived assets 61,673 73,558
Intangibles 34,385 37,282
Revenue recognition 4,264 4,268
Prepaid expenses 3,875 3,647
Total deferred tax liabilities 104,197 118,755
Net deferred tax liabilities $ (26,546) $ (6,064)