Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Condensed Consolidated Statements of Cash Flows
Net cash used in operating activities	$ (6,328)	$ (3,247)
Cash Flows from Investing Activities
Investments purchased	(123,747)	(289,784)
Investments sold	54,647	113,584
Investments called or matured	36,680	180,660
Net change in short-term investments	26,329	(6,775)
Net property and equipment purchased	(4,276)	(2,545)
Net cash used in investing activities	(10,367)	(4,860)
Cash Flows from Financing Activities
Cash dividends paid	(6,807)	(6,362)
Stock plan share issuance	819	2,736
Excess tax benefit from exercise of stock options	740	855
Net cash used in financing activities	(5,248)	(2,771)
Net decrease in cash	(21,943)	(10,878)
Cash at the beginning of the period	44,314	81,184
Cash at March 31	$ 22,371	$ 70,306