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CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY - USD ($) $ 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, 2013 | $ 2,204,602 | $ 42,201 | $ (167,983) | $ 710,940 | $ (8,361) | $ 1,627,805
Balance (in shares) at Dec. 31, 2013 |  | 422,015,000 | 5,618,000 |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net income (loss) | 104,468 |  |  |  |  | 104,468
Stock amortization and vesting | 958 | $ 91 |  | 867 |  |
Stock-based compensation | (1,375) |  |  | (1,375) |  |
Stock amortization and vesting (in shares) |  | 900,000 |  |  |  |
Purchase of treasury stock | $ (138,852) |  | $ (138,852) |  |  |
Purchase of treasury stock (in shares) | 4,300,000 |  | 4,275,000 |  |  |
Cash dividends at $0.08, $0.08 and $0.06 per share for the year ended December 31, 2015, 2014 and 2013, respectively | $ (33,278) |  |  |  |  | (33,278)
Other comprehensive income (loss) | 6,210 |  |  |  | 6,210 |
Balance at end 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 |  | 422,915,000 | 9,893,000 |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net income (loss) | (113,891) |  |  |  |  | (113,891)
Exercise of stock appreciation rights | (942) | $ 4 |  | (946) |  |
Exercise of stock appreciation rights (in shares) |  | 40,000 |  |  |  |
Stock amortization and vesting | $ 12,592 | $ 81 |  | 12,511 |  |
Stock amortization and vesting (in shares) |  | 814,000 |  |  |  |
Purchase of treasury stock (in shares) | 0 |  |  |  |  |
Cash dividends at $0.08, $0.08 and $0.06 per share for the year ended December 31, 2015, 2014 and 2013, respectively | $ (33,090) |  |  |  |  | (33,090)
Other comprehensive income (loss) | 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 |  | 423,769,000 | 9,893,000 |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net income (loss) | (417,124) |  |  |  |  | (417,124)
Issuance of common stock (in shares) |  | 50,600,000 |  |  |  |
Issuance of common stock | 995,289 | $ 5,060 |  | 990,229 |  |
Exercise of stock appreciation rights | (198) | $ 3 |  | (201) |  |
Exercise of stock appreciation rights (in shares) |  | 28,000 |  |  |  |
Stock amortization and vesting | 16,931 | $ 64 |  | 16,867 |  |
Sale of stock held in rabbi trust | 544 |  |  | 544 |  |
Stock-based compensation | $ (2,126) |  |  | (2,126) |  |
Stock amortization and vesting (in shares) |  | 646,000 |  |  |  |
Purchase of treasury stock (in shares) | 0 |  |  |  |  |
Cash dividends at $0.08, $0.08 and $0.06 per share for the year ended December 31, 2015, 2014 and 2013, respectively | $ (36,187) |  |  |  |  | (36,187)
Other comprehensive income (loss) | 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 |  | 475,043,000 | 9,893,000 |  |  |

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