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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands | Total | Common Stock | Additional Paid-in Capital | Retained Earnings | Accumulated Other Comprehensive Loss
--- | --- | --- | --- | --- | ---
Cash dividends per share | $ 0.10 |  |  |  |  |  |
Balances, Common Stock, Shares, Outstanding, Beginning at Dec. 31, 2014 |  | 67,463,060 |  |  |  |  |
Balances, Total stockholders' equity, beginning at Dec. 31, 2014 | $ 2,286,655 | $ 675 | $ 283,295 |  | $ 2,013,997 |  | $ (11,312)
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |
Net loss | (447,710) |  |  |  | (447,710) |  |
Other comprehensive income (loss) | (2,090) |  |  |  |  |  | (2,090)
Cash dividends, $ 0.10 per share | (6,772) |  |  |  | (6,772) |  |
Issuance of common stock under Employee Stock Purchase Plan (in shares) |  | 197,214 |  |  |  |  |
Issuance of common stock under Employee Stock Purchase Plan | 4,844 | $ 2 | 4,842 |  |  |  |
Issuance of common stock upon vesting of RSUs and settlement of PSUs, net of shares used for tax withholdings (in shares) |  | 375,523 |  |  |  |  |
Issuance of common stock upon vesting of RSUs and settlement of PSUs, net of shares used for tax withholdings | (8,678) | $ 4 | (8,682) |  |  |  |
Stock-based compensation expense (in shares) |  | 39,903 |  |  |  |  |
Stock-based compensation expense | 27,467 | $ 0 | 27,467 |  |  |  |
Adjustments to Additional Paid in Capital, Other | (1,315) |  | (1,315) |  |  |  |
Balances, Common Stock, Shares, Outstanding, Ending at Dec. 31, 2015 |  | 68,075,700 |  |  |  |  |
Balances, Total stockholders' equity, ending at Dec. 31, 2015 | $ 1,852,401 | $ 681 | 305,607 |  | 1,559,515 |  | (13,402)
Cash dividends per share | $ 0.10 |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |
Net loss | $ (757,744) |  |  |  | (757,744) |  |
Other comprehensive income (loss) | (1,154) |  |  |  |  |  | (1,154)
Cash dividends, $ 0.10 per share | (7,751) |  |  |  | (7,751) |  |
Issuance of common stock under Employee Stock Purchase Plan (in shares) |  | 218,135 |  |  |  |  |
Issuance of common stock under Employee Stock Purchase Plan | 4,198 | $ 2 | 4,196 |  |  |  |
Issuance of common stock upon vesting of RSUs and settlement of PSUs, net of shares used for tax withholdings (in shares) |  | 199,243 |  |  |  |  |
Issuance of common stock upon vesting of RSUs and settlement of PSUs, net of shares used for tax withholdings | (2,354) | $ 2 | (2,356) |  |  |  |
Stock-based compensation expense (in shares) |  | 53,473 |  |  |  |  |
Stock-based compensation expense | 26,897 | $ 1 | 26,896 |  |  |  |
Adjustments to Additional Paid in Capital, Other | (9,833) |  | (9,833) |  |  |  |
Issuance of common stock from stock offerings, net of tax (in shares) |  | 42,710,949 |  |  |  |  |
Issuance of common stock from stock offerings, net of tax | 1,383,093 | $ 427 | 1,382,666 |  |  |  |
Equity component of 1.50% Senior Convertible Notes due 2021 issuance, net of tax | 33,575 |  | 33,575 |  |  |  |
Purchase of capped call transactions | $ (24,195) |  | (24,195) |  |  |  |
Balances, Common Stock, Shares, Outstanding, Ending at Dec. 31, 2016 | 111,257,500 | 111,257,500 |  |  |  |  |
Balances, Total stockholders' equity, ending at Dec. 31, 2016 | $ 2,497,133 | $ 1,113 | 1,716,556 |  | 794,020 |  | (14,556)
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |
Cumulative effect of accounting change | $ 44,732 |  | 1,108 | [1] | 43,624 | [1] |
Cash dividends per share | $ 0.10 |  |  |  |  |  |
Net loss | $ (160,843) |  |  |  | (160,843) |  |
Other comprehensive income (loss) | 767 |  |  |  |  |  | 767
Cash dividends, $ 0.10 per share | (11,144) |  |  |  | (11,144) |  |
Issuance of common stock under Employee Stock Purchase Plan (in shares) |  | 186,665 |  |  |  |  |
Issuance of common stock under Employee Stock Purchase Plan | 2,623 | $ 2 | 2,621 |  |  |  |
Issuance of common stock upon vesting of RSUs and settlement of PSUs, net of shares used for tax withholdings (in shares) |  | 171,278 |  |  |  |  |
Issuance of common stock upon vesting of RSUs and settlement of PSUs, net of shares used for tax withholdings | (1,240) | $ 1 | (1,241) |  |  |  |
Stock-based compensation expense (in shares) |  | 71,573 |  |  |  |  |
Stock-based compensation expense | 22,700 | $ 1 | 22,699 |  |  |  |
Adjustments to Additional Paid in Capital, Other | $ (120) |  | (120) |  |  |  |
Issuance of common stock from stock offerings, net of tax (in shares) | 0 |  |  |  |  |  |
Balances, Common Stock, Shares, Outstanding, Ending at Dec. 31, 2017 | 111,687,016 | 111,687,016 |  |  |  |  |
Balances, Total stockholders' equity, ending at Dec. 31, 2017 | $ 2,394,608 | $ 1,117 | $ 1,741,623 |  | $ 665,657 |  | $ (13,789)
[1] | Refer to Recently Issued Accounting Standards in Note 1 – Summary of Significant Accounting Policies for additional information.

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