Net Income (Loss) Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Basic EPS
Net income (loss)	$ (10,955)	$ 14,497	$ 7,708	$ (5,899)
Weighted average shares
Basic (in shares)	179,241,000	153,972,000	179,071,000	152,110,000
Effect of stock-based compensation plans (in shares)	0	3,928,000	4,049,000	0
Diluted (in shares)	179,241,000	157,900,000	183,120,000	152,110,000
Income (loss) per share
Basic (in dollars per share)	$ (0.06)	$ 0.09	$ 0.04	$ (0.04)
Diluted (in dollars per share)	$ (0.06)	$ 0.09	$ 0.04	$ (0.04)
Convertible Senior Notes Due March 2028 [Member]
Earnings Per Share (Textual) [Abstract]
Debt Instrument, Interest Rate, Stated Percentage	3.25%		3.25%
Stock Options [Member]
Earnings Per Share (Textual) [Abstract]
Number of shares of common stock equivalents related to convertible debt	852,176	439,721	1,426,480	1,600,669

Earnings per share.

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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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Contractual interest rate for funds borrowed, under the debt agreement.

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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