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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (in thousands, except share data and dividends per share) - 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, 2015 |  |  |  | 68,075,700 |  |  |  |  |
Balances, Total stockholders' equity, beginning at Dec. 31, 2015 |  | $ 1,852,401 |  | $ 681 | $ 305,607 | $ 1,559,515 |  | $ (13,402) |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |
Net income (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 |  |  |  |
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) |  |  |  |
Adjustments to Additional Paid in Capital, Other |  | (9,833) |  |  | (9,833) |  |  |  |
Balances, Common Stock, Shares, Outstanding, Ending at Dec. 31, 2016 |  |  |  | 111,257,500 |  |  |  |  |
Balances, Total stockholders' equity, ending at Dec. 31, 2016 |  | $ 2,497,133 |  | $ 1,113 | 1,716,556 | 794,020 |  | (14,556) |
Cash dividends per share |  | $ 0.10 |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |
Net income (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 |  |  |  |
Issuance of common stock from stock offerings, net of tax (in shares) |  | 0 |  |  |  |  |  |  |
Adjustments to Additional Paid in Capital, Other |  | $ (120) |  |  | (120) |  |  |  |
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) |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |
Cumulative effect of accounting change | [1] | $ 44,732 |  |  | 1,108 | 43,624 |  |  |
Cash dividends per share |  | $ 0.10 |  |  |  |  |  |  |
Net income (loss) |  | $ 508,407 |  |  |  | 508,407 |  |  |
Other comprehensive income (loss) |  | 4,378 |  |  |  |  |  | 4,378 |
Cash dividends, $ 0.10 per share |  | (11,191) |  |  |  | (11,191) |  |  |
Issuance of common stock under Employee Stock Purchase Plan (in shares) |  |  |  | 199,464 |  |  |  |  |
Issuance of common stock under Employee Stock Purchase Plan |  | 3,187 |  | $ 2 | 3,185 |  |  |  |
Issuance of common stock upon vesting of RSUs and settlement of PSUs, net of shares used for tax withholdings (in shares) |  |  |  | 291,745 |  |  |  |  |
Issuance of common stock upon vesting of RSUs and settlement of PSUs, net of shares used for tax withholdings |  | (2,975) |  | $ 3 | (2,978) |  |  |  |
Stock-based compensation expense (in shares) |  |  |  | 63,741 |  |  |  |  |
Stock-based compensation expense |  | $ 23,908 |  | $ 0 | 23,908 |  |  |  |
Issuance of common stock from stock offerings, net of tax (in shares) |  | 0 |  |  |  |  |  |  |
Balances, Common Stock, Shares, Outstanding, Ending at Dec. 31, 2018 |  | 112,241,966 |  | 112,241,966 |  |  |  |  |
Balances, Total stockholders' equity, ending at Dec. 31, 2018 |  | $ 2,920,322 |  | $ 1,122 | 1,765,738 | 1,165,842 |  | (12,380) |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |
Cumulative effect of accounting change |  | $ 0 | [1] |  | $ 0 | $ 2,969 | [1] | $ (2,969) | [1]
[1] | (1) Refer to Recently Issued Accounting Standards in Note 1 – Summary of Significant Accounting Policies for additional information.

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- Definition Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 4.E) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74512-122707 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(31)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(30)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
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Period Type: | instant