Goodwill and Patent Impairment Charges (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Feb. 29, 2016	Jan. 02, 2015
Subsequent Event [Line Items]
Goodwill	$ 0				$ 30,149				$ 0	$ 30,149
Share Price	$ 4.29								$ 4.29			$ 3.16	$ 16.72
Estimated Fair Value of the Reporting Unit	$ 252,000								$ 252,000
Estimated Carrying Value of Reporting Unit, Market Capitalization Plus Cost Synergies Approach	344,300								344,300
Assets	347,901				536,348				347,901	536,348
Impairment of Goodwill	$ 30,149	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 30,149	$ 0	$ 0