Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Deferred tax assets:
Loss reserves	$ 58,251	$ 65,015
Employee benefits	68,254	64,843
Accrued expenses	4,340	15,763
Lease liability	55,543	0
Federal loss carryforwards	43,774	49,821
State loss carryforwards	1,186	7,225
Investment in debt securities assets (ASC 320)	0	24,863
Other	19,255	27,168
Gross deferred tax assets	250,603	254,698
Valuation allowance	0	(74)
Deferred tax assets after valuation allowance	250,603	254,624
Deferred tax liabilities:
Depreciation and amortization	50,725	51,519
Investment in debt securities liabilities (ASC 320)	10,154	0
Equity investments	3,656	7,705
Other intangible assets	56,352	57,632
Prepaid expenses	10,024	9,218
ROU lease asset	50,151	0
Other	540	683
Gross deferred tax liabilities	181,602	126,757
Net deferred tax assets	$ 69,001	$ 127,867