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Condensed Statements of Comprehensive Margin (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Condensed Statements of Comprehensive Margin
Net margin	$ 20,104	$ 23,743	$ 66,630	$ 48,141
Other comprehensive margin:
Unrealized (loss) gain on available-for-sale securities	205	42	(1,097)	870
Total comprehensive margin	$ 20,309	$ 23,785	$ 65,533	$ 49,011

The change in equity [net assets] of a business enterprise during a period from transactions and other events and circumstances from non-owner sources which are attributable to the reporting entity. It includes all changes in equity during a period except those resulting from investments by owners and distributions to owners, but excludes any and all transactions which are directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent.

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