Investments in Available-for-Sale Securities (Tables)

9 Months Ended

Sep. 30, 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:

	September 30, 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	$	123,809	$	7	$	(126	)	$	123,690	$	123,690	$	—
Corporate notes and bonds	125,479		21		(466		)	125,034		125,034		—
Equity securities	5,271		10,284		(2,865		)	12,690		—		12,690
Total Investments	$	254,559	$	10,312	$	(3,457	)	$	261,414	$	248,724	$	12,690

	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