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Supplemental Cash Flow Information	12 Months Ended
Supplemental Cash Flow Information	Dec. 31, 2014
Supplemental Cash Flow Information [Abstract]
Supplemental Cash Flow Information	SUPPLEMENTAL CASH FLOW INFORMATION Federal taxes paid totaled $0, $0 and $3,000,000 for the years ended December 31, 2015, 2014 and 2013, respectively. At December 31, 2013, prepaid expenses and other current assets included federal and state income taxes receivable totaling $3,251,000. Cash paid for state income taxes totaled $211,000, $172,000 and $516,000 for the years ended December 31, 2015, 2014 and 2013, respectively. Foreign taxes withheld totaled $4,421,000, $5,159,000 and $4,605,000 for the years ended December 31, 2015, 2014 and 2013. Refer to Note 6 to these notes to consolidated financial statements for information regarding noncash investing activity related to the investment in patent portfolios for the periods presented.