Stockholders Equity (Details 1) (USD $)	3 Months Ended
Jun. 30, 2012	Jun. 30, 2011
Changes in Redeemable Noncontrolling Interest
Stock option exercises, Value	$ 2,161,000
Share-based compensation	270,000
Net income	758,000	10,466,000
Stockholders Equity (Textual) [Abstract]
Pre-tax unrealized gain/loss on available-for-sale investments	40,000
Redeemable Noncontrolling Interest [Member]
Changes in Redeemable Noncontrolling Interest
Beginning Balance	86,541,000
Stock option exercises, Value	0
Share-based compensation	0
Net income	758,000
Other comprehensive loss	(13,000)
Ending Balance	$ 87,286,000

This element represents the amount of recognized equity-based compensation during the period, that is, the amount recognized as expense in the income statement (or as asset if compensation is capitalized). Alternate captions include the words "stock-based compensation".

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+ Details

- Definition

Before tax and reclassification adjustments amount of unrealized holding gain (loss) and transfers on available-for-sale securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Accounting Research Bulletin (ARB)

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

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+ Details

- Definition

Value of stock issued as a result of the exercise of stock options.

+ References+ Details