Debt (Tables)

6 Months Ended

Jun. 30, 2012

Debt Disclosure [Abstract]

Schedule of Debt

	As of		As of
	June 30,		December 31,
	2012		2011
Current debt:
Equipment financing credit facility	$	7,341	$	7,036
Capital lease	—		224
4% Convertible debentures	50,135		121,199
Total current debt	$	57,476	$	128,459
Long term debt:
Equipment financing credit facility	$	13,641	$	10,759
5% Convertible debentures	73,685		—
Total long term debt	$	87,326	$	10,759

Schedule of payments on outstanding debt

Schedule of payments on outstanding debt as of June 30, 2012:

	Six Months
Debt	2012		2013		2014		2015		2016		2017		Maturity
Equipment financing loans
principal	$	3,999	$	6,571	$	4,515	$	3,567	$	1,961	$	370	2012 to 2017
interest	658		941		556		288		101		6
4% Convertible debentures
principal	50,490		—		—		—		—		—		November 30, 2012
interest	1,010		—		—		—		—		—
5% Convertible debentures
principal	—		—		—		—		—		77,490		June 1, 2017
interest	1,937		3,875		3,875		3,875		3,875		1,937
Total	$	58,094	$	11,387	$	8,946	$	7,730	$	5,937	$	79,427