Fair Value Measurements, Unobservable Input Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Total realized/unrealized gains (losses) [Abstract]
State premium tax credit investments, average maturity	5 years
Annual average discount rate (in hundredths)	7.20%
Total Investments [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	$ 2,167	$ 2,744	$ 20,565
Total realized/unrealized gains (losses) [Abstract]
Included in earnings and reported as realized investment gains (losses), net			(225)
Included in earnings and reported as losses incurred, net	0	0	0
Included in other comprehensive income			0
Purchases	2,541	30	30
Sales	(625)	(607)	(17,626)
Balance at end of period	4,083	2,167	2,744
Obligations of U.S. States and Political Subdivisions
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	1,846	2,423	3,130
Total realized/unrealized gains (losses) [Abstract]
Included in earnings and reported as realized investment gains (losses), net			0
Included in earnings and reported as losses incurred, net	0	0	0
Included in other comprehensive income			0
Purchases	7	30	30
Sales	(625)	(607)	(737)
Balance at end of period	1,228	1,846	2,423
Corporate Debt Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period		0	17,114
Total realized/unrealized gains (losses) [Abstract]
Included in earnings and reported as realized investment gains (losses), net			(225)
Included in earnings and reported as losses incurred, net			0
Included in other comprehensive income			0
Purchases			0
Sales			(16,889)
Balance at end of period			0
Equity Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	321	321	321
Total realized/unrealized gains (losses) [Abstract]
Included in earnings and reported as realized investment gains (losses), net			0
Included in earnings and reported as losses incurred, net	0	0	0
Included in other comprehensive income			0
Purchases	2,534	0	0
Sales	0	0	0
Balance at end of period	2,855	321	321
Real Estate Acquired
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	12,658	13,280	3,463
Total realized/unrealized gains (losses) [Abstract]
Included in earnings and reported as realized investment gains (losses), net			0
Included in earnings and reported as losses incurred, net	(2,322)	(4,129)	(4,959)
Included in other comprehensive income			0
Purchases	34,624	42,247	39,188
Sales	(32,811)	(38,740)	(24,412)
Balance at end of period	$ 12,149	$ 12,658	$ 13,280