Income Taxes Reconciliation of Expected Federal Tax Expense to Actual (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Expected Tax Expense									$ 420	$ (1,045)	$ 1,919
Expected tax expense (benefit), percent									21.00%	35.00%	35.00%
Foreign income tax differential									$ (8,133)	$ 0	$ 0
Foreign income tax differential, percent									(406.30%)	0.00%	0.00%
Taxable stock sales									$ 0	$ 0	$ 263
Taxable stock sales, percent									0.00%	0.00%	4.80%
Tax-exempt interest and dividends-received deductions									$ (227)	$ (360)	$ (553)
Tax-exempt interest and dividends-received deductions, percent									(11.30%)	12.10%	(10.10%)
Adjustment of prior year income taxes									$ 113	$ 68	$ 29
Adjustment of prior year income taxes, percent									5.60%	(2.30%)	0.50%
Effect of graduated rates									$ 0	$ (140)	$ (57)
Effect of graduated rates, percent									0.00%	4.70%	(1.00%)
Effect of uncertain tax position									$ 2,612	$ (355)	$ 1,672
Effect of uncertain tax position, percent									130.50%	11.90%	30.50%
Nondeductible costs to remediate tax compliance issue									$ (366)	$ (384)	$ 241
Nondeductible costs to remediate tax compliance issue, percent									(18.30%)	12.90%	4.40%
Subpart F Income									$ 18,403	$ 0	$ 0
Subpart F Income, Percent									919.20%	0.00%	0.00%
Tax reform re-measurement									$ 68	$ 35,718	$ 0
Tax reform re-measurement, percent									3.40%	(1196.20%)	0.00%
Goodwill impairment									$ 0	$ 1,621	$ 0
Goodwill impairment, percent									0.00%	(54.30%)	0.00%
Other Reconciling Items									$ 174	$ 18	$ 0
Other reconciling items, percent									8.80%	(0.70%)	0.00%
Federal income tax expense	$ (596)	$ 12,671	$ (1,553)	$ 2,542	$ 35,069	$ (339)	$ 1,524	$ (1,113)	$ 13,064	$ 35,141	$ 3,514
Effective Income Tax Rate Reconciliation, Percent									652.60%	(1176.90%)	64.10%