CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Common Stock	Accumulated Other Comprehensive (Loss) Income	Accumulated Deficit	Total
Balance at Dec. 31, 2014	$ 1,360,668	$ 124	$ (919,577)	$ 441,215
Balance (in shares) at Dec. 31, 2014	300,100,000
Increase (Decrease) in Shareholders' Equity
Stock-based compensation	$ 409			409
Shares issued for the settlement of accounts payable	$ 443			443
Shares issued for settlement of accounts payable (in shares)	430,000
Unrealized gain (loss) on available-for-sale securities, net of taxes		(165)		(165)
Net loss			6,021	6,021
Balance at Mar. 31, 2015	$ 1,361,520	(41)	(913,556)	447,923
Balance (in shares) at Mar. 31, 2015	300,530,000
Balance at Dec. 31, 2014	$ 1,360,668	124	(919,577)	441,215
Balance (in shares) at Dec. 31, 2014	300,100,000
Increase (Decrease) in Shareholders' Equity
Share repurchase (note 7)				$ (1,800)
Share repurchase (note 7) (in shares)				(1,896,442)
Balance at Dec. 31, 2015	$ 1,359,144	(825)	(940,027)	$ 418,292
Balance (in shares) at Dec. 31, 2015	298,634,000
Increase (Decrease) in Shareholders' Equity
Stock-based compensation	$ 353			353
Return of capital distribution (note 7)	(1,491)			(1,491)
Unrealized gain (loss) on available-for-sale securities, net of taxes		(124)		(124)
Share repurchase (note 7)	$ (582)			$ (582)
Share repurchase (note 7) (in shares)	(558,000)			(557,991)
Other-than-temporary impairment on marketable equity securities (note 2)		285		$ 285
Net loss			12,985	12,985
Balance at Mar. 31, 2016	$ 1,357,424	$ (664)	$ (927,042)	$ 429,718
Balance (in shares) at Mar. 31, 2016	298,076,000