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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands | Total | Common Stock | Common stock held in treasury | Additional paid-in capital | Retained earnings/(deficit) | Accumulated other comprehensive (loss)
--- | --- | --- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2014 | $ 3,457,429 | $ 1,687 | $ (3,088) | $ 2,400,475 | $ 1,058,355 | $ 0
Beginning balance Shares at Dec. 31, 2014 |  | 168,711,000 |  |  |  |
Issuance of common stock | 10,073 | $ 6 | 0 | 10,067 | 0 | 0
Issuance of common stock, shares |  | 665,000 |  |  |  |
Stock-based compensation expense | 36,496 | $ 0 | 0 | 36,496 | 0 | 0
Tax benefit related to stock-based compensation | (3,572) | 0 | 0 | (3,572) | 0 | 0
Common dividends declared ($0.16 per share for 2015 and $0.08 per share for 2016, 2017) | (27,083) | 0 | 0 | 0 | (27,083) | 0
Treasury stock issuance |  | 0 | 843 | (843) | 0 | 0
Net income (loss) | (713,685) | 0 | 0 | 0 | (713,685) | 0
Ending balance at Dec. 31, 2015 | 2,759,658 | $ 1,693 | (2,245) | 2,442,623 | 317,587 | 0
Ending balance Shares at Dec. 31, 2015 |  | 169,376,000 |  |  |  |
Issuance of common stock | 3,048,653 | $ 778 | 0 | 3,047,875 | 0 | 0
Issuance of common stock, shares |  | 77,799,000 |  |  |  |
Stock-based compensation expense | 37,023 | $ 0 | 0 | 37,023 | 0 | 0
Tax benefit related to stock-based compensation | (2,062) | 0 | 0 | (2,062) | 0 | 0
Common dividends declared ($0.16 per share for 2015 and $0.08 per share for 2016, 2017) | (16,682) | 0 | 0 | 0 | (16,682) | 0
Cumulative-effect adjustment from adoption of ASU 2016-09 | 103,166 | 0 | 0 | 0 | 103,166 | 0
Treasury stock issuance |  | 0 | 1,036 | (1,036) | 0 | 0
Net income (loss) | (521,388) | 0 | 0 | 0 | (521,388) | 0
Ending balance at Dec. 31, 2016 | $ 5,408,368 | $ 2,471 | (1,209) | 5,524,423 | (117,317) | 0
Ending balance Shares at Dec. 31, 2016 | 247,174,903 | 247,175,000 |  |  |  |
Issuance of common stock | $ 2,987 | $ 10 | 0 | 2,977 | 0 | 0
Issuance of common stock, shares |  | 969,000 |  |  |  |
Stock-based compensation expense | 50,942 | $ 0 | 0 | 50,942 | 0 | 0
Common dividends declared ($0.16 per share for 2015 and $0.08 per share for 2016, 2017) | (19,839) | 0 | 0 | 0 | (19,839) | 0
Treasury stock issuance | 0 | 0 | 610 | (610) | 0 | 0
Other comprehensive loss | (1,332) | 0 | 0 | 0 | 0 | (1,332)
Net income (loss) | 333,146 | 0 | 0 | 0 | 333,146 | 0
Ending balance at Dec. 31, 2017 | $ 5,774,272 | $ 2,481 | $ (599) | $ 5,577,732 | $ 195,990 | $ (1,332)
Ending balance Shares at Dec. 31, 2017 | 248,144,397 | 248,144,000 |  |  |  |

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