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INCOME TAXES (Deferred) (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Deferred tax assets:    
Accrued expenses $ 41,757 $ 39,885
Operating lease liabilities 19,726  
Pension liabilities   1,721
Supplemental pension liabilities 1,091 1,033
Multiemployer pension fund withdrawal 5,546 5,710
Postretirement liabilities other than pensions 5,359 7,660
Share-based compensation 5,605 4,893
Federal and state net operating loss carryforwards 1,093 1,152
Other 1,538 1,355
Total deferred tax assets 81,715 63,409
Valuation allowance (668) (53)
Total deferred tax assets, net of valuation allowance 81,047 63,356
Deferred tax liabilities:    
Amortization, depreciation, and basis differences for property, plant and equipment, and other long-lived assets 107,835 93,525
Operating lease right-of-use assets 18,703  
Intangibles 7,373 14,066
Revenue recognition 669 1,513
Prepaid expenses 4,952 3,225
Total deferred tax liabilities 139,532 112,329
Net deferred tax liabilities $ (58,485) $ (48,973)