Reserves for Unpaid Losses and Loss Adjustment Expenses (Incurred and Paid Claims Development - Personal Segment) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($) claim	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)	Dec. 31, 2011 USD ($)	Dec. 31, 2010 USD ($)	Dec. 31, 2009 USD ($)
Liability For Unpaid Claims and Claims Adjustment Expense, Incurred Claims [Abstract]
Incurred claims and claim adjustment expenses related to prior years	$ 5,953	$ 40,105
Incurred claims and claim adjustment expenses related to current year	250,075	248,203
Total incurred	256,028	288,308
Liability For Unpaid Claims and Claims Adjustment Expense, Claims Paid [Abstract]
Paid claims and allocated claim adjustment expenses related to prior years	232,345	181,277
Paid claims and allocated claim adjustment expenses related to current year	90,640	92,873
Total paid	322,985	274,150
Liabilities for unpaid claims and claim adjustment expenses, net of reinsurance	305,531	372,488	$ 358,330
Personal Segment [Member]
Liability For Unpaid Claims and Claims Adjustment Expense, Incurred Claims [Abstract]
Total incurred	459,145
Liability For Unpaid Claims and Claims Adjustment Expense, Claims Paid [Abstract]
Total paid	450,406
All outstanding liabilities before 2009, net of reinsurance	5
Liabilities for unpaid claims and claim adjustment expenses, net of reinsurance	8,743
Personal Segment [Member] | Loss Adjustment Expenses Recognized In 2009 [Member]
Liability For Unpaid Claims and Claims Adjustment Expense, Incurred Claims [Abstract]
Incurred claims and claim adjustment expenses related to prior years	$ 50,005	49,971	49,891	$ 49,772	$ 49,694	$ 48,930	$ 47,977	$ 46,244	$ 42,092	$ 40,436
Cumulative number of reported claims | claim	21,056
Liability For Unpaid Claims and Claims Adjustment Expense, Claims Paid [Abstract]
Paid claims and allocated claim adjustment expenses related to prior years	$ 49,992	49,957	49,853	49,704	49,539	49,287	47,967	44,689	37,621	$ 23,306
Personal Segment [Member] | Loss Adjustment Expenses Recognized In 2010 [Member]
Liability For Unpaid Claims and Claims Adjustment Expense, Incurred Claims [Abstract]
Incurred claims and claim adjustment expenses related to prior years	$ 84,867	84,808	84,591	84,252	83,903	84,724	80,765	78,294	63,862
Cumulative number of reported claims | claim	30,180
Liability For Unpaid Claims and Claims Adjustment Expense, Claims Paid [Abstract]
Paid claims and allocated claim adjustment expenses related to prior years	$ 84,768	84,717	84,556	84,111	83,511	82,624	75,199	67,755	$ 38,643
Personal Segment [Member] | Loss Adjustment Expenses Recognized In 2011 [Member]
Liability For Unpaid Claims and Claims Adjustment Expense, Incurred Claims [Abstract]
Incurred claims and claim adjustment expenses related to prior years	$ 87,199	86,853	86,948	86,804	86,757	87,810	77,652	75,746
Cumulative number of reported claims | claim	31,615
Liability For Unpaid Claims and Claims Adjustment Expense, Claims Paid [Abstract]
Paid claims and allocated claim adjustment expenses related to prior years	$ 86,989	86,660	86,593	86,217	85,533	83,497	67,939	$ 46,416
Personal Segment [Member] | Loss Adjustment Expenses Recognized In 2012 [Member]
Liability For Unpaid Claims and Claims Adjustment Expense, Incurred Claims [Abstract]
Incurred claims and claim adjustment expenses related to prior years	$ 72,076	72,037	72,042	71,513	70,552	73,795	58,604
Cumulative number of reported claims | claim	23,939
Liability For Unpaid Claims and Claims Adjustment Expense, Claims Paid [Abstract]
Paid claims and allocated claim adjustment expenses related to prior years	$ 72,094	72,055	71,995	70,807	68,849	64,278	$ 37,860
Personal Segment [Member] | Loss Adjustment Expenses Recognized In 2013 [Member]
Liability For Unpaid Claims and Claims Adjustment Expense, Incurred Claims [Abstract]
Incurred claims and claim adjustment expenses related to prior years	$ 60,328	60,379	60,211	60,100	59,132	55,706
Cumulative number of reported claims | claim	23,471
Liability For Unpaid Claims and Claims Adjustment Expense, Claims Paid [Abstract]
Paid claims and allocated claim adjustment expenses related to prior years	$ 60,297	60,277	59,775	58,047	54,514	$ 45,901
Personal Segment [Member] | Loss Adjustment Expenses Recognized In 2014 [Member]
Liability For Unpaid Claims and Claims Adjustment Expense, Incurred Claims [Abstract]
Incurred claims and claim adjustment expenses related to prior years	$ 6,504	6,699	6,243	5,340	5,452
Cumulative number of reported claims | claim	19,293
Liability For Unpaid Claims and Claims Adjustment Expense, Claims Paid [Abstract]
Paid claims and allocated claim adjustment expenses related to prior years	$ 6,566	6,428	5,631	4,418	$ 2,515
Personal Segment [Member] | Loss Adjustment Expenses Recognized in 2015 [Member]
Liability For Unpaid Claims and Claims Adjustment Expense, Incurred Claims [Abstract]
Incurred claims and claim adjustment expenses related to prior years	25,136	25,307	25,682	23,104
Total of incurred-but-not-reported liabilities plus expected development on reported claims	$ 120
Cumulative number of reported claims | claim	23,370
Liability For Unpaid Claims and Claims Adjustment Expense, Claims Paid [Abstract]
Paid claims and allocated claim adjustment expenses related to prior years	$ 25,243	24,262	22,281	$ 11,570
Personal Segment [Member] | Loss Adjustment Expenses Recognized in 2016 [Member]
Liability For Unpaid Claims and Claims Adjustment Expense, Incurred Claims [Abstract]
Incurred claims and claim adjustment expenses related to prior years	32,728	32,893	32,260
Total of incurred-but-not-reported liabilities plus expected development on reported claims	$ 129
Cumulative number of reported claims | claim	23,745
Liability For Unpaid Claims and Claims Adjustment Expense, Claims Paid [Abstract]
Paid claims and allocated claim adjustment expenses related to prior years	$ 32,260	30,646	$ 21,669
Personal Segment [Member] | Loss Adjustment Expenses Recognized in 2017 [Member]
Liability For Unpaid Claims and Claims Adjustment Expense, Incurred Claims [Abstract]
Incurred claims and claim adjustment expenses related to prior years	21,968	23,342
Total of incurred-but-not-reported liabilities plus expected development on reported claims	$ 208
Cumulative number of reported claims | claim	16,748
Liability For Unpaid Claims and Claims Adjustment Expense, Claims Paid [Abstract]
Paid claims and allocated claim adjustment expenses related to prior years	$ 21,061	$ 15,776
Personal Segment [Member] | Loss Adjustment Expenses Recognized In 2018 [Member]
Liability For Unpaid Claims and Claims Adjustment Expense, Incurred Claims [Abstract]
Incurred claims and claim adjustment expenses related to prior years	18,334
Total of incurred-but-not-reported liabilities plus expected development on reported claims	$ 2,613
Cumulative number of reported claims | claim	14,248
Liability For Unpaid Claims and Claims Adjustment Expense, Claims Paid [Abstract]
Paid claims and allocated claim adjustment expenses related to current year	$ 11,137