Significant Accounting Policies Recognition of Costs (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Recognition of underwriting, acquisition and insurance costs [Line Items]
Commission expense, net of deferrals	$ 24,419	$ 23,801	$ 24,356
Amortization of deferred acquisition costs	22,887	33,137	22,507
Amortization of value of insurance in force acquired	2,141	2,167	2,178
Other underwriting, acquisition and insurance expenses, net of deferrals	91,177	92,950	85,837
Total	$ 140,624	$ 152,055	$ 134,878