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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Deferred income tax assets:    
Insurance liabilities $ 62,473 $ 58,582
Pension liability 8,950 6,255
Deferred compensation 35,649 28,033
Other (including liabilities and reserves) 32,350 28,562
Total deferred income tax assets 139,422 121,432
Valuation allowance for deferred tax assets (3,531) (805)
Net deferred income tax assets 135,891 120,627
Deferred income tax liabilities:    
Goodwill and identifiable intangible assets (229,347) (218,715)
Depreciation of property, plant and equipment (18,145) (17,211)
Other (5,761) (5,299)
Total deferred income tax liabilities (253,253) (241,225)
Net deferred income tax liabilities $ (117,362) $ (120,598)