Summary of Significant Policies (Details 9) (USD $) In Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Comprehensive income (loss)
Net Income (Loss)	$ 3,949	$ (1,619)	$ 6,353	$ 5,723
Other comprehensive income (loss):
Realized gain on marketable securities reclassified to earnings, net of income tax expense of $2,968, $1,992, $10,405 and $1,992	(5,512)	(3,700)	(19,324)	(3,700)
Unrealized gain (loss) on marketable securities, net of income tax expense (benefit) of $(2,307), ($10,630), $8,252, and ($11,188)	(4,285)	(19,742)	15,325	(20,778)
Total comprehensive income (loss)	$ (5,848)	$ (25,061)	$ 2,354	$ (18,755)

The portion of consolidated profit or loss for the period, net of income taxes, which is attributable to the parent. If the entity does not present consolidated financial statements, the amount of profit or loss for the period, net of income taxes.

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Appreciation or loss in value (before reclassification adjustment) of the total of unsold securities during the period being reported on, net of tax. Reclassification adjustments include: (1) the unrealized holding gain or loss, net of tax, at the date of the transfer for a debt security from the held-to-maturity category transferred into the available-for-sale category. Also includes the unrealized gain or loss at the date of transfer for a debt security from the available-for-sale category transferred into the held-to-maturity category; (2) the unrealized gains or losses realized upon the sale of securities, after tax; and (3) the unrealized gains or losses realized upon the write-down of securities, after tax.

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