Patent Assets, Net (Tables)

6 Months Ended

Jun. 30, 2013

Patent Assets [Abstract]

Patent Assets, Net [Text Block]

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

	December 31, 2012			Additions			Disposals			June 30, 2013
Patent assets	$	403,875		$	68,537		$	(300	)	$	472,112
Accumulated amortization	(204,561		)	(46,263		)	74			(250,750		)
Patent assets, net	$	199,314								$	221,362

Expected Future Annual Amortization Of Patent Assets [Text Block]

The following table summarizes the expected future annual amortization expense of patent assets as of June 30, 2013 (in thousands):

2013 (remainder)	$	47,627
2014	75,803
2015	57,047
2016	31,806
2017	8,228
Thereafter	851
Total estimated future amortization expense	$	221,362