Selected Quarterly Financial Data (Details) - USD ($) $ / shares in Units, shares in Thousands, $ 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
Condensed Financial Statements, Captions
Revenues	$ 127,280	$ 566	$ 376	$ 1,792	$ 21,482	$ 419	$ 676	$ 277	$ 130,014	$ 22,854	$ 2,222
Income (Loss) From Operations	88,360	(33,677)	(26,688)	(26,527)	(3,447)	(40,336)	(26,111)	(30,472)	$ 1,468	$ (100,366)	$ (102,371)
Net Income (Loss) Available to Common Stockholders, Basic	86,750	$ (35,282)	$ (26,074)	$ (28,076)	$ (2,933)	$ (40,498)	$ (26,028)	$ (30,835)
Net Income (Loss) Available to Common Stockholders, Diluted	$ 88,027
Earnings Per Share, Basic	$ 0.84	$ (0.34)	$ (0.27)	$ (0.27)
Earnings Per Share, Diluted	$ 0.76	$ (0.34)	$ (0.27)	$ (0.27)
Weighted Average Number of Shares Outstanding, Basic	103,623	103,616	103,608	103,516
Incremental Common Shares Attributable to Dilutive Effect of Conversion of Debt Securities	10,365
Weighted Average Number of Shares Outstanding, Diluted	115,764	103,616	103,608	103,516
Consolidated Net Loss Per Common Share, Basic and Diluted					$ (0.03)	$ (0.55)	$ (0.35)	$ (0.42)	$ (0.05)	$ (1.31)	$ (1.42)
Shares Used In Computing Consolidated Net Loss Per Common Share Basic And Diluted					84,813	73,542	73,518	73,422	103,591	76,347	73,302
Interest on Convertible Debt, Net of Tax	$ 1,277
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	1,776