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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Deferred income tax assets: |  |  |
Insurance liabilities | $ 47,022 |  | $ 44,192
Pension liability | 2,733 |  | 3,204
Operating lease liabilities (1) | 68,158 | [1] | 0
Deferred compensation | 32,685 |  | 29,300
Other (including liabilities and reserves) | 25,647 |  | 27,400
Total deferred income tax assets | 176,245 |  | 104,096
Valuation allowance for deferred tax assets | (3,463) |  | (3,855)
Net deferred income tax assets | 172,782 |  | 100,241
Deferred income tax liabilities: |  |  |
Goodwill and identifiable intangible assets | (156,604) |  | (152,761)
Operating lease right-of-use assets (1) | (65,090) | [1] | 0
Depreciation of property, plant and equipment | (18,622) |  | (14,904)
Other | (4,212) |  | (3,424)
Total deferred income tax liabilities | (244,528) |  | (171,089)
Net deferred income tax liabilities | $ (71,746) |  | $ (70,848)
[1] | As discussed in Note 2 - Summary of Significant Accounting Policies of the notes to consolidated financial statements, on January 1, 2019, we adopted the accounting pronouncement issued by the Financial Accounting Standards Board (“FASB”), which required lessees to record right-of-use assets and corresponding lease liabilities on the balance sheet for most leases. We adopted this pronouncement utilizing the transition practical expedient added by the FASB, which eliminated the requirement that entities apply the new lease standard to the comparative periods presented in the year of adoption.

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