Patent Assets, Net (Tables)

9 Months Ended

Sep. 30, 2012

Patent Assets [Abstract]

Schedule of Patent Assets [Text Block]

Patent assets, net consisted of the following (in thousands):

	December 31, 2011			Additions			Patent assets acquired in business combination		Sale			September 30, 2012
Patent assets	$	287,555		$	65,360		$	27,850	$	(50	)	$	380,715
Accumulated amortization	(124,203		)	(59,218		)	—		27			(183,394		)
Patent assets, net	$	163,352										$	197,321

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Text Block]

The following table summarizes the expected future annual amortization expense of patent assets as of September 30, 2012 (in thousands):

2012 (remainder)	$	20,532
2013	72,022
2014	47,096
2015	33,482
2016	20,547
Thereafter	3,642
Total estimated future amortization expense	$	197,321