Basic and Diluted Net Income (Loss) Per Share - Anti-Dilutive Securities (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Stock Compensation Plan [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	5,615,000	4,184,000	5,615,000	4,184,000
Contingently Issuable Shares [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount		800,000	0	1,100,000
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	3,561,000	2,476,000	3,561,000	2,476,000
ERROR in label resolution.
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	376,000	658,000	376,000	658,000
Securities Excluded from Computation of Earnings Per Share, Performance Target Not Met, Amount	1,678,000	1,050,000	1,678,000	1,050,000
Convertible Debt Securities [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	2,100,000	3,800,000	2,300,000	3,600,000
Long-term Incentive Plan [Member] | ERROR in label resolution.
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Securities Excluded from Computation of Earnings Per Share, Performance Target Not Met, Amount	1,500,000
Overlay Plan [Member] | ERROR in label resolution.
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Securities Excluded from Computation of Earnings Per Share, Performance Target Met, Amount	200,000