Net Loss Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Net Income (Loss) (Numerator) [Abstract]
Net Income (Loss) Available to Common Stockholders, Basic	$ 36,975		$ 16,589
Dilutive effect of potential settlement of contingent consideration liability	500		0
Net Income (Loss) Available to Common Stockholders, Diluted	37,475		16,589
Net loss basic and diluted	$ 36,975	$ (10,500)	$ 16,589	$ (34,021)
Weighted Average Common Shares (Denominator) Abstract
Weighted Average Number of Shares Outstanding, Basic	69,556	60,599	67,712	54,104
Weighted Average Number of Shares Outstanding, Diluted	72,879	60,599	67,727	54,104
Dilutive effect of potential settlement of contingent consideration liability (shares)	3,295		0
Weighted Average Number Diluted Shares Outstanding Adjustment	28		15
Shares outstanding, basic and diluted (in shares)		60,599		54,104
Per share amount [Abstract]
Earnings Per Share, Basic	$ 0.53	$ (0.17)	$ 0.24	$ (0.63)
Earnings Per Share, Diluted	$ 0.51	$ (0.17)	$ 0.24	$ (0.63)
Net loss per share, basic and diluted (in dollars per share)		$ (0.17)		$ (0.63)
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Weighted Average Number (in shares)			8,652	6,047
Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Weighted Average Number (in shares)	5,267	6,068	5,357	6,047
Weighted Average Exercise Price (in dollars per share)	$ 10.23	$ 11.14	$ 10.31	$ 11.69
Contingent Consideration Liability [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Weighted Average Number (in shares)			3,295	0