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Condensed Statements of Comprehensive Margin (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Condensed Statements of Comprehensive Margin
Net margin	$ 22,024	$ 13,520
Other comprehensive margin:
Unrealized (loss) gain on available-for-sale securities	(212)	709
Total comprehensive margin	$ 21,812	$ 14,229

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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