Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2012

Fair Value Measurements [Abstract]

Fair Value, by Balance Sheet Grouping [Table Text Block]

	Assets and Liabilities at Fair Value as of June 30, 2012
	Level 1		Level 2		Level 3		Total
	(in thousands)
Assets
Cash and cash equivalents	$	33,779	$	—	$	—	$	33,779
Short-term investments	197,734		—		—		197,734
Total cash and cash equivalents and investments	$	231,513	$	—	$	—	$	231,513
Liabilities
Other long-term liabilities	$	—	$	—	$	59,276	$	59,276
Total liabilities	$	—	$	—	$	59,276	$	59,276

	Assets and Liabilities at Fair Value as of December 31, 2011
	Level 1		Level 2		Level 3		Total
	(in thousands)
Assets
Cash and cash equivalents	$	186,309	$	—	$	—	$	186,309
Short-term investments	95,383		—		—		95,383
Total cash and cash equivalents and investments	$	281,692	$	—	$	—	$	281,692
Liabilities
Other long-term liabilities	$	—	$	—	$	55,033	$	55,033
Total liabilities	$	—	$	—	$	55,033	$	55,033

Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]

	Other Long-term Liabilities
	(in thousands)
Balance at December 31, 2011	$	55,033
Change in valuation of purchase consideration payable to former Symphony Icon stockholders	4,243
Balance at June 30, 2012	$	59,276
Balance at December 31, 2010	$	48,267
Change in valuation of purchase consideration payable to former Symphony Icon stockholders	2,862
Balance at June 30, 2011	$	51,129