CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (USD $) In Thousands, except Share data, unless otherwise specified	Total	Common Stock	Additional Paid-in Capital	Accumulated Deficit	Accumulated Other Comprehensive income (loss)
Balance at Dec. 31, 2010	$ 131,818	$ 152	$ 185,051	$ (53,550)	$ 165
Balance (in shares) at Dec. 31, 2010		15,124,567
Increase (Decrease) in Stockholders' Equity
Stock compensation accrued	5,540		5,540
Stock compensation accrued (in shares)		331,166
Treasury shares acquired and retired	(1,834)		(1,834)
Treasury shares acquired and retired (in shares)		(106,056)
Warrants exercised		1	(1)
Warrants exercised (in shares)		104,889
Shares issued to ECU shareholder's and officers	224,675	161	224,514
Shares issued to ECU shareholder's and officers (in shares)		16,117,319
ECU replacement options and warrants	9,853		9,853
Private placements stock units, net	30,674	41	30,633
Private placements stock units, net (in shares)		4,118,150
Unrealized gain (loss) on marketable equity securities, net of tax	(287)				(287)
Net loss	(62,671)			(62,671)
Balance at Dec. 31, 2011	337,768	355	453,756	(116,221)	(122)
Balance (in shares) at Dec. 31, 2011		35,690,035
Increase (Decrease) in Stockholders' Equity
Stock compensation accrued	2,589	9	2,580
Stock compensation accrued (in shares)		712,500
Registered offering stock units, net	29,433	55	29,378
Registered offering stock units, net (in shares)		5,497,504
Private placements stock units, net	7,475	14	7,461
Private placements stock units, net (in shares)		1,365,794
Unrealized gain (loss) on marketable equity securities, net of tax	32				32
Net loss	(92,025)			(92,025)
Balance at Dec. 31, 2012	285,272	433	493,175	(208,246)	(90)
Balance (in shares) at Dec. 31, 2012		43,265,833
Increase (Decrease) in Stockholders' Equity
Stock compensation accrued	979		979
Stock compensation accrued (in shares)		152,000
Realized gain (loss) on marketable equity securities, net of tax	90				90
Net loss	(224,065)			(224,065)
Balance at Jun. 30, 2013	$ 62,276	$ 433	$ 494,154	$ (432,311)
Balance (in shares) at Jun. 30, 2013		43,417,833