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Condensed Consolidated Statements of Stockholders' Equity Statement - USD ($) $ in Thousands | Total | Common Stock [Member] | Additional Paid-in Capital [Member] | Treasury Stock [Member] | Retained Earnings [Member] | AOCI Attributable to Parent [Member]
--- | --- | --- | --- | --- | --- | ---
Total Stockholders' Equity at Dec. 31, 2017 | $ 2,930,250 | $ 3 | $ 361,231 | $ (217) | $ 1,830,439 | $ 738,794
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net Income (Loss) Attributable to Parent | 656,774 |  |  |  | 656,774 |
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent | 44,548 |  |  |  |  | 44,548
APIC, Share-based Payment Arrangement, Increase for Cost Recognition | 5,885 |  | 5,885 |  |  |
Proceeds from Issuance of Common Stock | 3,872 |  | 3,872 |  |  |
Total Stockholders' Equity at Mar. 31, 2018 | 4,488,091 | 3 | 370,988 | (217) | 4,013,232 | 104,085
Total Stockholders' Equity at Dec. 31, 2017 | 2,930,250 | 3 | 361,231 | (217) | 1,830,439 | 738,794
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net Income (Loss) Attributable to Parent | 1,194,143 |  |  |  |  |
Proceeds from Issuance of Common Stock | 10,858 |  |  |  |  |
Total Stockholders' Equity at Sep. 30, 2018 | 4,900,481 | 3 | 382,393 | (217) | 4,550,601 | (32,299)
Total Stockholders' Equity at Mar. 31, 2018 | 4,488,091 | 3 | 370,988 | (217) | 4,013,232 | 104,085
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net Income (Loss) Attributable to Parent | 268,043 |  |  |  | 268,043 |
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent | (122,795) |  |  |  |  | (122,795)
APIC, Share-based Payment Arrangement, Increase for Cost Recognition | 6,205 |  | 6,205 |  |  |
Proceeds from Issuance of Common Stock | (598) |  | (598) |  |  |
Total Stockholders' Equity at Jun. 30, 2018 | 4,638,946 | 3 | 376,595 | (217) | 4,281,275 | (18,710)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net Income (Loss) Attributable to Parent | 269,326 |  |  |  | 269,326 |
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent | (13,589) |  |  |  |  | (13,589)
APIC, Share-based Payment Arrangement, Increase for Cost Recognition | 7,076 |  | 7,076 |  |  |
Proceeds from Issuance of Common Stock | (1,278) |  | (1,278) |  |  |
Total Stockholders' Equity at Sep. 30, 2018 | 4,900,481 | 3 | 382,393 | (217) | 4,550,601 | (32,299)
Total Stockholders' Equity at Dec. 31, 2018 | 4,020,331 | 3 | 394,342 | (49,129) | 3,722,073 | (46,958)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net Income (Loss) Attributable to Parent | 865,195 |  |  |  | 865,195 |
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent | (34,007) |  |  |  |  | (34,007)
APIC, Share-based Payment Arrangement, Increase for Cost Recognition | 8,505 |  | 8,505 |  |  |
Treasury Stock Reissued at Lower than Repurchase Price | 3,831 |  |  | 5,398 | (1,567) |
Total Stockholders' Equity at Mar. 31, 2019 | 4,863,855 | 3 | 402,847 | (43,731) | 4,585,701 | (80,965)
Total Stockholders' Equity at Dec. 31, 2018 | 4,020,331 | 3 | 394,342 | (49,129) | 3,722,073 | (46,958)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net Income (Loss) Attributable to Parent | 1,205,189 |  |  |  |  |
Proceeds from Issuance of Common Stock | 9,740 |  |  |  |  |
Total Stockholders' Equity at Sep. 30, 2019 | 5,131,192 | 3 | 396,432 | (30,443) | 4,917,313 | (152,113)
Total Stockholders' Equity at Mar. 31, 2019 | 4,863,855 | 3 | 402,847 | (43,731) | 4,585,701 | (80,965)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net Income (Loss) Attributable to Parent | 598,810 |  |  |  | 598,810 |
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent | 31,392 |  |  |  |  | 31,392
APIC, Share-based Payment Arrangement, Increase for Cost Recognition | 7,818 |  | 7,818 |  |  |
Proceeds from Issuance of Common Stock | (64) |  | (64) |  |  |
Total Stockholders' Equity at Jun. 30, 2019 | 5,486,810 | 3 | 410,601 | (58,732) | 5,184,511 | (49,573)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Treasury Stock, Value, Acquired, Cost Method | (15,001) |  |  | (15,001) |  |
Net Income (Loss) Attributable to Parent | (258,816) |  |  |  | (258,816) |
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent | (102,540) |  |  |  |  | (102,540)
APIC, Share-based Payment Arrangement, Increase for Cost Recognition | 9,029 |  | 9,029 |  |  |
Treasury Stock Reissued at Lower than Repurchase Price | 0 |  | (24,906) | 33,288 | (8,382) |
Proceeds from Issuance of Common Stock | 1,708 |  | 1,708 |  |  |
Total Stockholders' Equity at Sep. 30, 2019 | 5,131,192 | $ 3 | $ 396,432 | (30,443) | $ 4,917,313 | $ (152,113)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Treasury Stock, Value, Acquired, Cost Method | $ (4,999) |  |  | $ (4,999) |  |

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