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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Deferred income tax assets: |  |
Insurance liabilities | $ 42,425 | $ 62,473
Pension liability | 6,900 | 8,950
Deferred compensation | 27,742 | 35,649
Other (including liabilities and reserves) | 28,534 | 32,350
Total deferred income tax assets | 105,601 | 139,422
Valuation allowance for deferred tax assets | (3,825) | (3,531)
Net deferred income tax assets | 101,776 | 135,891
Deferred income tax liabilities: |  |
Goodwill and identifiable intangible assets | (150,900) | (229,347)
Depreciation of property, plant and equipment | (11,781) | (18,145)
Other | (3,792) | (5,761)
Total deferred income tax liabilities | (166,473) | (253,253)
Net deferred income tax liabilities | $ (64,697) | $ (117,362)

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