Investments in Available-for-Sale Securities (Tables)

3 Months Ended

Mar. 31, 2013

Available-for-sale Securities [Abstract]

Available-for-sale Securities [Table Text Block]

The Company's investments in available-for-sale marketable securities are as follows:

	March 31, 2013
										Balance Sheet
			Gross		Gross					Classification
			Unrealized		Unrealized			Fair		Short-Term		Other
	Cost Basis		Gains		Losses			Value		Investments		Assets
	(In thousands)
Available-for-sale:
U.S. government and agency securities	$	135,457	$	1	$	(705	)	$	134,753	$	134,753	$	—
Corporate notes and bonds	114,905		—		(1,244		)	113,661		113,661		—
Equity securities	5,271		5,547		(2,774		)	8,044		—		8,044
Total Investments	$	255,633	$	5,548	$	(4,723	)	$	256,458	$	248,414	$	8,044

	December 31, 2012
										Balance Sheet
			Gross		Gross					Classification
			Unrealized		Unrealized			Fair		Short-Term		Other
	Cost Basis		Gains		Losses			Value		Investments		Assets
	(In thousands)
Available-for-sale:
U.S. government and agency securities	$	146,993	$	2	$	(412	)	$	146,583	$	146,583	$	—
Corporate notes and bonds	88,118		—		(396		)	87,722		87,722		—
Equity securities	5,271		2,704		(2,628		)	5,347		—		5,347
Total Investments	$	240,382	$	2,706	$	(3,436	)	$	239,652	$	234,305	$	5,347