Nature of Operations and Basis of Presentation (Narrative) (Details)		3 Months Ended
	Sep. 18, 2017 segment	Mar. 31, 2019 USD ($) segment state	Mar. 31, 2018 USD ($)	Jan. 01, 2019 USD ($)	Dec. 31, 2018 USD ($)	Jan. 01, 2018 USD ($)
Segment Reporting Information [Line Items]
Number of business segments | segment	2	1
Payment for income taxes		$ 19,000	$ 19,000
Federal tax refund received		5,401,000	1,503,000
Interest payments		0	0
Federal income tax expense (benefit)		10,156,000	1,209,000
Liability for unrecognized tax benefits		0			$ 0
Lease right-of-use assets		19,595,000
Lease obligations		$ 20,101,000
Property and Casualty Insurance
Segment Reporting Information [Line Items]
Number of states in which we are licensed as insurer | state		46
Continuing and Discontinuing Operations
Segment Reporting Information [Line Items]
Federal income tax expense (benefit)			$ 9,316,000
Accounting Standards Update 2016-02
Segment Reporting Information [Line Items]
Lease right-of-use assets				$ 19,800,000
Lease obligations				20,300,000
Retained earnings
Segment Reporting Information [Line Items]
Cumulative effect of change in accounting principle				513,000		$ (191,244,000)
Retained earnings | Accounting Standards Update 2016-02
Segment Reporting Information [Line Items]
Cumulative effect of change in accounting principle				387,000
Retained earnings | Accounting Standards Update 2016-01
Segment Reporting Information [Line Items]
Cumulative effect of change in accounting principle				$ 126,000