Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Income Statement [Abstract]
Revenue	$ 312,828		$ 258,785		$ 146,982
Cost of revenue	181,209		152,965		94,012
Gross margin	131,619		105,820		52,970
Expenses:
Selling, general and administrative	66,415		50,612		41,861
Depreciation and amortization	4,410		3,983		4,543
Research and development	3,182		2,337		1,441
Impairment of long-lived assets	0		0		8,898
(Gain) loss on disposal of long-lived assets	(1,009)		0		2,104
Impairment of other intangible assets	0		0		390
Total expenses	72,998		56,932		59,237
Income (loss) from operations	58,621		48,888		(6,267)
Other income (expense):
Loss on extinguishment of debt	(7,257)		(3,225)		(995)
Change in fair value of warrant liability	2,649		9,571		(21,464)
Interest expense	(8,103)		(15,960)		(19,399)
Other financing costs	0		0		(816)
Other expense, net	(452)		(4)		(69)
Total other income (expense)	(13,163)		(9,618)		(42,743)
Income (loss) before income taxes	45,458		39,270		(49,010)
Income tax benefit (expense)	4,333		(7,862)		5,545
Net income (loss)	49,791		31,408		(43,465)
Accrued dividends and accretion of discount on preferred stock	0		(4,868)		(6,543)
Net income (loss) attributable to common stockholders	$ 49,791		$ 26,540		$ (50,008)
Earnings (loss) per common share:
Basic earnings (loss) per common share	$ 1.03	[1]	$ 0.60	[1]	$ (1.94)
Diluted earnings (loss) per common share	$ 0.97	[1]	$ 0.56	[1]	$ (1.94)
Weighted average common shares:
Weighted average common shares used in computing basic earnings (loss) per common share (in shares)	48,185		44,229		25,731
Weighted average common shares used in computing diluted earnings (loss) per common share	53,554		47,638		25,731

[1] The sum of the quarterly earnings per share applicable to common stockholders (basic and diluted) may not agree to the earnings per share for the year due to the timing of common stock issuances.