Summary of Significant Accounting Policies (Net Earnings (Loss) Per Share) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net earnings (loss)	$ 14,284us-gaap_NetIncomeLoss	$ (15,674)us-gaap_NetIncomeLoss
Interest on convertible senior notes	$ 1,884	$ 0
Earnings (loss) used in calculating diluted earnings per share	16168	-15674
Weighted average number of shares outstanding, basic	117,737	116,134
Dilutive effect of common shares equivalents	28,905	0
Shares used in calculating diluted earnings per share	146,642	116,134
Net earnings (loss) per common share, basic	$ 0.12us-gaap_EarningsPerShareBasic	$ (0.13)us-gaap_EarningsPerShareBasic
Net earnings (loss) per common share, diluted	$ 0.11us-gaap_EarningsPerShareDiluted	$ (0.13)us-gaap_EarningsPerShareDiluted
Antidilutive securities excluded from computation of earnings per share, amount	9,273	45,839
Shares underlying Senior Convertible Notes
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, amount	0	28,088
Options to purchase common stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, amount	9,032	14,608
Restricted Stock Units (RSUs)
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, amount	41	2,893
Warrants to purchase common stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, amount	200	250

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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