Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Deferred income tax assets:
Insurance liabilities	$ 58,582	$ 54,351
Pension liability	6,255	10,142
Deferred compensation	28,033	17,886
Other (including liabilities and reserves)	28,562	31,828
Total deferred income tax assets	121,432	114,207
Valuation allowance for deferred tax assets	(805)	(2,024)
Net deferred income tax assets	120,627	112,183
Deferred income tax liabilities:
Goodwill and identifiable intangible assets	(218,715)	(216,126)
Other, primarily depreciation of property, plant and equipment	(22,510)	(23,884)
Total deferred income tax liabilities	(241,225)	(240,010)
Net deferred income tax liabilities	$ (120,598)	$ (127,827)