Fair Value Measurements, Unobservable Input Reconciliation (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Obligations of U.S. States and Political Subdivisions [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at beginning of period	$ 2,378	$ 2,957	$ 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	0
Purchases	0	0	30	30
Sales	(147)	(146)	(222)	(349)
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	0
Balance at end of period	2,231	2,811	2,231	2,811
Amount of total losses included in earnings for the three months ended June 30, 2014 attributable to the change in unrealized losses on assets still held at June 30, 2014	0	0	0	0
Corporate Debt Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
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		0
Purchases		0		0
Sales		0		(16,889)
Transfers into Level 3		0		0
Transfers out of Level 3		0		0
Balance at end of period		0		0
Amount of total losses included in earnings for the three months ended June 30, 2014 attributable to the change in unrealized losses on assets still held at June 30, 2014		0		0
Equity Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at beginning of period	321	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	0
Purchases	0	0	0	0
Sales	0	0	0	0
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	0
Balance at end of period	321	321	321	321
Amount of total losses included in earnings for the three months ended June 30, 2014 attributable to the change in unrealized losses on assets still held at June 30, 2014	0	0	0	0
Total Investments [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at beginning of period	2,699	3,278	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	0
Purchases	0	0	30	30
Sales	(147)	(146)	(222)	(17,238)
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	0
Balance at end of period	2,552	3,132	2,552	3,132
Amount of total losses included in earnings for the three months ended June 30, 2014 attributable to the change in unrealized losses on assets still held at June 30, 2014	0	0	0	0
Real Estate Acquired [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at beginning of period	11,137	7,524	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	(1,157)	(1,000)	(2,316)	(2,302)
Purchases	11,367	9,530	19,377	17,544
Sales	(10,543)	(7,313)	(19,537)	(9,964)
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	0
Balance at end of period	10,804	8,741	10,804	8,741
Amount of total losses included in earnings for the three months ended June 30, 2014 attributable to the change in unrealized losses on assets still held at June 30, 2014	$ 0	$ 0	$ 0	$ 0