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CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($) $ in Thousands | Mandatory Convertible Preferred Shares Preferred Stock | 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, 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 |  | 367,510,000 |  |  |  |  |  |
Increase (Decrease) in Equity |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  | (144,201) |  | 539 | (143,662)
Dividends to common shareholders |  |  |  |  | (19,050) |  |  | (19,050)
Other comprehensive income (loss), net of tax |  |  |  | (18,336) |  |  | (96) | (18,432)
Issuance of common shares for stock options exercised, net of surrender of unexercised stock options |  |  | 8,628 |  |  |  |  | 8,628
Adjustment to retained earnings | Accounting Standards Update 2016-01 |  |  |  |  | 9,144 |  |  | 9,144
Adjustment to retained earnings | Accounting Standards Update 2016-16 |  |  |  |  | (34,132) |  |  | (34,132)
Adjustment to retained earnings |  |  |  | (9,144) |  |  |  |
Less: accrued distribution on redeemable noncontrolling interest in subsidiary |  |  |  |  | (2,399) |  |  | (2,399)
Other |  | $ 2 | (1,864) |  |  |  |  | (1,862)
Other (in shares) |  | 2,810,000 |  |  |  |  |  |
Balance at the end of the period at Mar. 31, 2018 |  | $ 370 | 2,797,893 | (7,151) | 1,232,516 | (1,314,020) | 27,400 | 2,737,008
Balance (in shares) at Mar. 31, 2018 |  | 370,320,000 |  |  |  |  |  |
Balance at the beginning of the period at Dec. 31, 2018 | $ 6 | $ 410 | 3,392,937 | (29,325) | 650,842 | (1,314,020) | 49,476 | 2,750,326
Balance (in shares) at Dec. 31, 2018 | 5,750 | 409,652,000 |  |  |  |  |  |
Increase (Decrease) in Equity |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  | (117,709) |  | 14,176 | (103,533)
Dividends to common shareholders |  |  |  |  | (3,947) |  |  | (3,947)
Dividends to preferred shareholders ($0.75 per share) |  |  |  |  | (4,313) |  |  | (4,313)
Other comprehensive income (loss), net of tax |  |  |  | 9,338 |  |  | 52 | 9,390
Share-based compensation |  |  | 8,424 |  |  |  |  | 8,424
Adjustment to retained earnings |  |  |  |  |  |  |  | 0
Less: accrued distribution on redeemable noncontrolling interest in subsidiary |  |  |  |  | (5,063) |  |  | (5,063)
Other |  | $ 6 | (1,251) |  |  |  |  | (1,245)
Other (in shares) |  | 6,264,000 |  |  |  |  |  |
Balance at the end of the period at Mar. 31, 2019 | $ 6 | $ 416 | $ 3,400,110 | $ (19,987) | $ 519,810 | $ (1,314,020) | $ 63,704 | $ 2,650,039
Balance (in shares) at Mar. 31, 2019 | 5,750 | 415,916,000 |  |  |  |  |  |

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