Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Net cash provided by (used in) operating activities	$ (3,247)	$ 17,938
Cash Flows from Investing Activities
Investments purchased	(289,784)	(60,240)
Investments sold	113,584	76,360
Investments called or matured	180,660	39,787
Net change in short-term investments	(6,775)	(69,590)
Net property and equipment purchased	(2,545)	(1,030)
Net cash used in investing activities	(4,860)	(14,713)
Cash Flows from Financing Activities
Cash dividends paid	(6,362)	(6,104)
Stock option plan share issuance	2,736	918
Excess tax benefit from exercise of stock options	855	1,961
Treasury shares purchased	0
Net cash used in financing activities	(2,771)	(3,225)
Net decrease in cash	(10,878)
Cash at the beginning of the period	81,184	0
Cash at March 31	$ 70,306	$ 0