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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands | Total | Common Stock | Additional Paid-in Capital | Treasury Stock | Retained Earnings | Accumulated Other Comprehensive Income (Loss)
--- | --- | --- | --- | --- | --- | ---
Common Stock, Dividends, Per Share, Declared | $ 0.10 |  |  |  |  |
Balances, Common Shares, Beginning at Dec. 31, 2013 |  | 67,078,853 |  |  |  |
Balances, Beginning at Dec. 31, 2013 | $ 1,606,821 | $ 671 | $ 257,720 |  | $ 1,354,669 | $ (5,416)
Balances, Treasury Shares, Beginning at Dec. 31, 2013 |  |  |  | (22,412) |  |
Balances, Treasury Stock, Value, Beginning at Dec. 31, 2013 |  |  |  | $ (823) |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net income (loss) | 666,051 |  |  |  | 666,051 |
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent | (5,896) |  |  |  |  | (5,896)
Cash dividends, $ 0.10 per share | (6,723) |  |  |  | (6,723) |
Issuance of common stock under Employee Stock Purchase Plan (in shares) |  | 83,136 |  |  |  |
Issuance of common stock under Employee Stock Purchase Plan | 4,061 | $ 1 | 4,060 |  |  |
Issuance of common stock upon vesting of RSUs and settlement of PSUs, net of shares used for tax withholdings (in shares) |  | 256,718 |  |  |  |
Issuance of common stock upon vesting of RSUs and settlement of PSUs, net of shares used for tax withholdings | $ (10,624) | $ 3 | (10,627) |  |  |
Issuance of common stock upon stock option exercises (in shares) | 39,088 | 39,088 |  |  |  |
Issuance of common stock upon stock option exercises | $ 816 |  | 816 |  |  |
Stock-based compensation expense (in shares) |  | 5,265 |  | 22,412 |  |
Stock-based compensation expense | 32,694 |  | 31,871 | $ 823 |  |
Other income tax expense | (545) |  | (545) |  |  |
Balances, Common Shares, Ending at Dec. 31, 2014 |  | 67,463,060 |  |  |  |
Balances, Ending at Dec. 31, 2014 | $ 2,286,655 | $ 675 | 283,295 |  | 2,013,997 | (11,312)
Balances, Treasury Shares, Ending at Dec. 31, 2014 |  |  |  | 0 |  |
Balances, Treasury Stock, Value, Ending at Dec. 31, 2014 |  |  |  | $ 0 |  |
Common Stock, Dividends, Per Share, Declared | $ 0.10 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net income (loss) | $ (447,710) |  |  |  | (447,710) |
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent | (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 |  | 27,467 |  |  |
Other income tax expense | (1,315) |  | (1,315) |  |  |
Balances, Common Shares, Ending at Dec. 31, 2015 |  | 68,075,700 |  |  |  |
Balances, Ending at Dec. 31, 2015 | $ 1,852,401 | $ 681 | 305,607 |  | 1,559,515 | (13,402)
Balances, Treasury Shares, Ending at Dec. 31, 2015 |  |  |  | 0 |  |
Balances, Treasury Stock, Value, Ending at Dec. 31, 2015 |  |  |  | $ 0 |  |
Common Stock, Dividends, Per Share, Declared | $ 0.10 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net income (loss) | $ (757,744) |  |  |  | (757,744) |
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent | (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) |  |  |
Other income tax expense | (9,833) |  | (9,833) |  |  |
Balances, Common Shares, Ending at Dec. 31, 2016 |  | 111,257,500 |  |  |  |
Balances, Ending at Dec. 31, 2016 | $ 2,497,133 | $ 1,113 | $ 1,716,556 |  | $ 794,020 | $ (14,556)
Balances, Treasury Shares, Ending at Dec. 31, 2016 |  |  |  | 0 |  |
Balances, Treasury Stock, Value, Ending at Dec. 31, 2016 |  |  |  | $ 0 |  |

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