Supplementary Financial Data (Details) - USD ($) $ / shares in Units, $ in Thousands						3 Months Ended								12 Months Ended
	Jul. 24, 2015	Apr. 24, 2015	Feb. 20, 2015	Oct. 16, 2014	Jul. 25, 2014	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
Supplementary Financial Data
Net revenue						$ 22,836	$ 13,562	$ 10,655	$ 6,896	$ 7,280	$ 999	$ 934	$ (780)	$ 53,949	$ 8,433	$ 4,532
Total operating expenses						(5,543)	(5,128)	(5,547)	(6,151)	(7,150)	(10,541)	(10,728)	(13,943)	(22,369)	(42,362)	(33,327)
Income (loss) from operations						17,293	8,434	5,108	745					31,580	(33,929)	(28,795)
Loss from continuing operations										(15,926)	(21,271)	(20,151)	(16,182)	(18,760)	(73,530)	(30,633)
Income (loss) from discontinued operations										0	0	(43,413)	(51,521)	0	(94,934)	(140,068)
Net income (loss)						$ 4,301	$ (4,584)	$ (7,810)	$ (10,667)	$ (15,926)	$ (21,271)	$ (63,564)	$ (67,703)	$ (18,760)	$ (168,464)	$ (170,701)
Basic and diluted net loss per common share:
Continuing operations, net of tax										$ (0.14)	$ (0.19)	$ (0.18)	$ (0.15)	$ (0.16)	$ (0.66)	$ (0.30)
Discontinued operations (in dollars per share)										0.00	0.00	(0.39)	(0.47)	0.00	(0.84)	(1.37)
Basic and diluted net loss per share (in dollars per share)						$ 0.04	$ (0.04)	$ (0.07)	$ (0.09)	(0.14)	(0.19)	(0.57)	(0.62)	(0.16)	(1.50)	(1.67)
Cash dividend declared per common share (in dollars per share)	$ 0.25	$ 0.25	$ 0.25	$ 0.25	$ 0.25	$ 0	$ 0.25	$ 0.25	$ 0.25	$ 0.25	$ 0.25	$ 0	$ 0	$ 0.75	$ 0.50	$ 0.00