Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Fixed maturities, held-to-maturity securities, fair value	$ 192	$ 199
Fixed maturities, available-for-sale securities, amortized cost	2,912,326	2,887,505
Fixed maturities, trading securities, amortized cost	13,945	13,054
Equity securities, available-for-sale securities, amortized cost	62,533	68,504
Equity securities, trading securities, amortized cost	6,046	5,434
Allowance for doubtful accounts	1,178	1,255
Property and equipment accumulated depreciation	$ 51,144	$ 50,925
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	75,000,000	75,000,000
Common stock, shares issued (in shares)	25,028,037	25,429,769
Common stock, shares outstanding (in shares)	25,028,037	25,429,769