Unaudited Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Unaudited Consolidated Statements of Cash Flows [Abstract]
Net cash provided by operating activities	$ 30,806	$ 31,110
Investing activities:
Purchases of available-for-sale investments	(275,591)	(201,523)
Purchases of limited partnership interests	0	(4,212)
Proceeds from sales or maturities of available-for-sale investments	262,707	204,979
Net sales of short-term investments	746	1,726
Other investing activities	(1,281)	(9,744)
Net cash used in investing activities	(13,419)	(8,774)
Financing activities:
Dividends paid to shareholders	(11,267)	(11,222)
Drawings on line of credit	0	10,000
Net cash used in financing activities	(11,267)	(1,222)
Effect of foreign exchange rates on cash and cash equivalents	(1,102)	(835)
Increase in cash and cash equivalents	5,018	20,279
Cash and cash equivalents at beginning of period	64,632	59,297
Cash and cash equivalents at end of period	$ 69,650	$ 79,576