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CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($) $ in Thousands | Common Shares | Capital in Excess of Par Value | Accumulated Other Comprehensive Income | Retained Earnings | Treasury Shares | Non-controlling Interest | Total
--- | --- | --- | --- | --- | --- | --- | ---
Balance at the beginning of the period at Dec. 31, 2014 | $ 328 | $ 2,452,261 | $ 77,522 | $ 3,573,172 | $ (1,194,664) | $ 10,170 | $ 4,918,789
Balance (in shares) at Dec. 31, 2014 | 328,196 |  |  |  |  |  |
Increase (Decrease) in Equity |  |  |  |  |  |  |
Net income (loss) |  |  |  | (372,675) |  | 381 | (372,294)
Dividends to shareholders |  |  |  | (69,363) |  |  | (69,363)
Repurchase of treasury shares |  |  |  |  | (99,598) |  | (99,598)
Other comprehensive income (loss), net of tax |  |  | (125,115) |  |  | (1,461) | (126,576)
Issuance of common shares for stock options exercised, net of surrender of unexercised stock options |  | 1,296 |  |  |  |  | 1,296
Issuance of common shares for stock options exercised, net of surrender of unexercised stock options (in shares) | 141 |  |  |  |  |  |
Share-based compensation |  | 47,863 |  |  |  |  | 47,863
Other | $ 3 | (8,320) |  |  |  | 2,068 | (6,249)
Other (in shares) | 2,189 |  |  |  |  |  |
Balance at the end of the period at Dec. 31, 2015 | $ 331 | 2,493,100 | (47,593) | 3,131,134 | (1,294,262) | 11,158 | 4,293,868
Balance (in shares) at Dec. 31, 2015 | 330,526 |  |  |  |  |  |
Increase (Decrease) in Equity |  |  |  |  |  |  |
Net income (loss) |  |  |  | (1,029,742) |  | 135 | (1,029,607)
Dividends to shareholders |  |  |  | (67,965) |  |  | (67,965)
Repurchase of treasury shares |  |  |  |  | (1,687) |  | (1,687)
Other comprehensive income (loss), net of tax |  |  | 35,474 |  |  | 251 | 35,725
Issuance of common shares for stock options exercised, net of surrender of unexercised stock options |  | 967 |  |  |  |  | 967
Issuance of common shares for stock options exercised, net of surrender of unexercised stock options (in shares) | 102 |  |  |  |  |  |
Share-based compensation |  | 32,000 |  |  |  |  | 32,000
Other | $ 3 | (4,735) |  |  |  | (3,774) | (8,506)
Other (in shares) | 2,970 |  |  |  |  |  |
Balance at the end of the period at Dec. 31, 2016 | $ 334 | 2,521,332 | (12,119) | 2,033,427 | (1,295,949) | 7,770 | 3,254,795
Balance (in shares) at Dec. 31, 2016 | 333,598 |  |  |  |  |  |
Increase (Decrease) in Equity |  |  |  |  |  |  |
Net income (loss) |  |  |  | (546,811) |  | 6,178 | (540,633)
Dividends to shareholders |  |  |  | (68,612) |  |  | (68,612)
Repurchase of treasury shares |  |  |  |  | (18,071) |  | (18,071)
Other comprehensive income (loss), net of tax |  |  | 23,304 |  |  | 282 | 23,586
Issuance of common shares for stock options exercised, net of surrender of unexercised stock options | $ 1 | (10,736) |  |  |  |  | (10,735)
Issuance of common shares for stock options exercised, net of surrender of unexercised stock options (in shares) | 842 |  |  |  |  |  |
Equity component of exchangeable debt |  | 116,195 |  |  |  |  | 116,195
Capped call transactions |  | (40,250) |  |  |  |  | (40,250)
Adoption of ASU No. 2016-09 |  | 1,943 |  | 5,150 |  |  | 7,093
Share-based compensation |  | 31,896 |  |  |  |  | 31,896
Issuance to Tesco shareholders | $ 32 | 178,961 |  |  |  |  | 178,993
Issuance to Tesco shareholders (in shares) | 32,078 |  |  |  |  |  |
Noncontrolling interest contributions (distributions), net |  |  |  |  |  | 13,018 | 13,018
Other | $ 1 | (8,212) |  |  |  | (291) | (8,502)
Other (in shares) | 992 |  |  |  |  |  |
Balance at the end of the period at Dec. 31, 2017 | $ 368 | $ 2,791,129 | $ 11,185 | $ 1,423,154 | $ (1,314,020) | $ 26,957 | $ 2,938,773
Balance (in shares) at Dec. 31, 2017 | 367,510 |  |  |  |  |  |

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