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CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands | Total | Common Stock | Treasury Stock | Paid-In Capital | Accumulated Other Comprehensive Income (Loss) | Retained Earnings
--- | --- | --- | --- | --- | --- | ---
Balance at beginning of period at Dec. 31, 2014 | $ 2,142,733 | $ 42,292 | $ (306,835) | $ 710,432 | $ (2,151) | $ 1,698,995
Balance (in shares) at Dec. 31, 2014 |  | 422,915 | 9,893 |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net income (loss) | (113,891) |  |  |  |  | (113,891)
Issuance of common stock | (942) | $ 4 |  | (946) |  |
Exercise of stock appreciation rights (in shares) |  | 40 |  |  |  |
Exercise of stock appreciation rights | 12,592 | $ 81 |  | 12,511 |  |
Stock amortization and vesting (in shares) |  | 814 |  |  |  |
Cash dividends | (33,090) |  |  |  |  | (33,090)
Other comprehensive income | 1,786 |  |  |  | 1,786 |
Balance at end of period at Dec. 31, 2015 | 2,009,188 | $ 42,377 | $ (306,835) | 721,997 | (365) | 1,552,014
Balance (in shares) at Dec. 31, 2015 |  | 423,769 | 9,893 |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net income (loss) | (417,124) |  |  |  |  | (417,124)
Issuance of common stock (in shares) |  | 50,600 |  |  |  |
Issuance of common stock | 995,289 | $ 5,060 |  | 990,229 |  |
Issuance of common stock | (198) | $ 3 |  | (201) |  |
Exercise of stock appreciation rights (in shares) |  | 28 |  |  |  |
Exercise of stock appreciation rights | 16,931 | $ 64 |  | 16,867 |  |
Sale of stock held in rabbi trust | 544 |  |  | 544 |  |
Stock amortization and vesting | (2,126) |  |  | (2,126) |  |
Stock amortization and vesting (in shares) |  | 646 |  |  |  |
Cash dividends | (36,187) |  |  |  |  | (36,187)
Other comprehensive income | 1,350 |  |  |  | 1,350 |
Balance at end of period at Dec. 31, 2016 | 2,567,667 | $ 47,504 | $ (306,835) | 1,727,310 | 985 | 1,098,703
Balance (in shares) at Dec. 31, 2016 |  | 475,043 | 9,893 |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Cumulative effect from accounting change | 42,172 |  |  |  |  | 42,172
Net income (loss) | 100,393 |  |  |  |  | 100,393
Issuance of common stock | 0 | $ 14 |  | (14) |  |
Exercise of stock appreciation rights (in shares) |  | 137 |  |  |  |
Exercise of stock appreciation rights | 15,160 | $ 37 |  | 15,123 |  |
Stock amortization and vesting (in shares) |  | 367 |  |  |  |
Cash dividends | (78,838) |  |  |  |  | (78,838)
Purchase of treasury stock (in shares) |  |  | 5,043 |  |  |
Purchase of treasury stock | (123,741) |  | $ (123,741) |  |  |
Other comprehensive income | 1,092 |  |  |  | 1,092 |
Balance at end of period at Dec. 31, 2017 | $ 2,523,905 | $ 47,555 | $ (430,576) | $ 1,742,419 | $ 2,077 | $ 1,162,430
Balance (in shares) at Dec. 31, 2017 |  | 475,547 | 14,936 |  |  |

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