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8. Other Income and Expenses (Details) (USD $)	3 Months Ended		6 Months Ended
8. Other Income and Expenses (Details) (USD $)	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Interest and investment income	$ (4,900,000)	$ (2,800,000)	$ (5,600,000)	$ (3,600,000)
Net realized losses (gains) on investments	100,000	0	(200,000)	(300,000)
Miscellaneous other (income) expense items	400,000	300,000	400,000	600,000
Other (income) expense, net	$ (4,418,000)	$ (2,517,000)	$ (5,369,000)	$ (3,316,000)

Income derived from investments in debt and equity securities and on cash and cash equivalents. Interest income represents earnings which reflect the time value of money or transactions in which the payments are for the use or forbearance of money. Dividend income represents a distribution of earnings to shareholders by investee companies.

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