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INCOME TAXES (Deferred) (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Deferred tax assets:    
Accrued expenses $ 53,366 $ 50,351
Pension liabilities 4,869 10,797
Postretirement liabilities other than pensions 9,903 9,552
Share-based compensation 6,961 6,926
Federal and state net operating loss carryforwards 2,229 2,185
Other 1,856 2,032
Total deferred tax assets 79,184 81,843
Valuation allowance (293) (354)
Total deferred tax assets, net of valuation allowance 78,891 81,489
Deferred tax liabilities:    
Amortization, depreciation, and basis differences for property, plant and equipment, and other long-lived assets 95,248 84,150
Intangibles 24,715 28,272
Revenue recognition 5,679 4,176
Prepaid expenses 5,109 4,503
Total deferred tax liabilities 130,751 121,101
Net deferred tax liabilities $ (51,860) $ (39,612)