Net Income (Loss) Per Share (Details) - $ / shares shares in Thousands	3 Months Ended
Mar. 31, 2019	Mar. 31, 2018
Net income (loss) per share.
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	2,784	1,673
Convertible Senior Notes Due 2020 \| Convertible Common Stock
Net income (loss) per share.
Net shares issued	0
Minimum stock price to trigger conversion of debt (in dollars per share)	$ 200
Dilutive Securities impact on diluted net income (in dollars per share)	$ 0.00

The amount of net income (loss) derived from continuing operations during 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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+ Details