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Cash, Cash Equivalents and Investments (Tables)

12 Months Ended

Dec. 31, 2011

Cash, Cash Equivalents, and Investments [Abstract]

Components of cash, cash equivalents and investments


		December 31,
		2011				2010
Cash		$	36,404			$	26,650
Money market instruments			1,699				6,553

Cash and cash equivalents			38,103				33,203

Corporate bonds			55,570				34,543
Municipal bonds			54,036				75,457
Agency bonds			27,545				15,979
Sovereign bonds			4,016				19,350
Treasury bills			1,945				2,494
Covered bonds			1,319				-

Short-term investments			144,431				147,823

Municipal bonds			69,680				34,794
Corporate bonds			59,902				36,762
Sovereign bonds			22,355				-
Agency bonds			12,335				21,025
Covered bonds			4,701				3,541
Limited partnership interest (accounted for using cost method)			5,933				5,933

Long-term investments			174,906				102,055

		$	357,440			$	283,081

Summary of available-for-sale investments


		Amortized Cost				Gross Unrealized Gains				Gross Unrealized Losses				Fair Value
Short-term:
Corporate bonds		$	56,277			$	32			$	(739	)		$	55,570
Municipal bonds			53,974				65				(3	)			54,036
Agency bonds			27,676				19				(150	)			27,545
Sovereign bonds			3,973				43				-				4,016
Treasury bills			1,944				1				-				1,945
Covered bonds			1,317				2				-				1,319

Long-term:
Municipal bonds			69,576				201				(97	)			69,680
Corporate bonds			59,461				467				(26	)			59,902
Sovereign bonds			22,029				326				-				22,355
Agency bonds			12,371				35				(71	)			12,335
Covered bonds			4,679				22				-				4,701

		$	313,277			$	1,213			$	(1,086)			$	313,404

Gross unrealized losses and fair value for available-for-sale investments


		Unrealized Loss Position For:
		Less than 12 Months								12 Months or Greater								Total
		Fair Value				Unrealized Losses				Fair Value				Unrealized Losses				Fair Value				Unrealized Losses
Corporate bonds		$	42,094			$	(754	)		$	5,316			$	(11	)		$	47,410			$	(765	)
Municipal bonds			34,657				(100	)			-				-				34,657				(100	)
Agency bonds			24,610				(220	)			3,280				(1	)			27,890				(221	)

		$	101,361			$	(1,074	)		$	8,596			$	(12	)		$	109,957			$	(1,086	)

Effective maturity dates of available-for-sale investments


		<1 Year				1-2 Years				2-3 Years				3-4 Years				4-5 Years				Total
Municipal bonds		$	54,036			$	25,713			$	23,976			$	-			$	19,991			$	123,716
Corporate bonds			55,570				33,555				21,543				2,398				2,406				115,472
Agency bonds			27,545				7,700				4,635				-				-				39,880
Sovereign bonds			4,016				10,831				5,933				-				5,591				26,371
Covered bonds			1,319				4,701				-				-				-				6,020
Treasury bills			1,945				-				-				-				-				1,945

		$	144,431			$	82,500			$	56,087			$	2,398			$	27,988			$	313,404

Summary of available-for-sale investments held in its international portfolio


Short-term		Corporate bonds				Agency bonds				Sovereign bonds				Treasury bills				Covered bonds				Total
Australia		$	3,235			$	-			$	-			$	-			$	-			$	3,235
Canada			3,551				-				-				-				-				3,551
France			3,374				-				-				-				-				3,374
Germany			5,062				3,636				3,973				-				-				12,671
Great Britain			10,836				5,466				-				-				1,317				17,619
Japan			1,332				-				-				-				-				1,332
Netherlands			2,202				10,379				-				1,945				-				14,526
Supranational			-				2,865				-				-				-				2,865
Sweden			1,943				3,557				-				-				-				5,500
Switzerland			3,542				-				-				-				-				3,542

Total		$	35,077			$	25,903			$	3,973			$	1,945			$	1,317			$	68,215


Long-term		Corporate bonds				Sovereign bonds				Agency bonds				Covered bonds				Total
Austria		$	-			$	-			$	3,062			$	-			$	3,062
Canada			-				-				4,568				-				4,568
Denmark			-				-				-				1,694				1,694
Finland			-				1,880				-				-				1,880
France			4,100				-				-				-				4,100
Germany			3,498				16,522				-				-				20,020
Great Britain			6,346				-				-				-				6,346
Japan			1,853				-				-				-				1,853
Netherlands			6,831				3,952				1,334				1,673				13,790
Norway			-				-				-				1,333				1,333
Sweden			-				-				1,004				-				1,004
Switzerland			2,149				-				-				-				2,149

Total		$	24,777			$	22,354			$	9,968			$	4,700			$	61,799