Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Available-for-sale Debt securities, Amortized cost	$ 98,743	$ 110,738
Available-for-sale Equity securities, Amortized cost	$ 38,856	$ 17,248
Preferred stock, no par value
Preferred stock, authorized	18,100,000	18,100,000
Preferred stock, issued	0	0
Preferred stock, outstanding	0	0
Common stock, no par value
Common stock, shares authorized	40,000,000	40,000,000
Common stock, shares issued	10,447,807	10,939,268
Common stock, outstanding	10,447,807	10,939,268
7% Series A Cumulative Convertible Preferred Stock [Member]
Preferred stock, liquidation preference, per share	$ 10.00	$ 10.00
Preferred stock, no par value
Preferred stock, authorized	1,500,000	1,500,000
Preferred stock, issued	0	110,684
Preferred stock, outstanding	0	110,684
Series B Preferred Stock [Member]
Preferred stock, no par value
Preferred stock, authorized	400,000	400,000
Preferred stock, issued	0	0
Preferred stock, outstanding	0	0