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Change in Accounting Principle: Inventories (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 9 Months Ended |  | 3 Months Ended | 9 Months Ended |  |  | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended |
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Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Dec. 31, 2013 | Sep. 30, 2013 Change in Accounting Method for Inventory Valuation Effect of Change in Accounting Principle | Sep. 30, 2013 Change in Accounting Method for Inventory Valuation Effect of Change in Accounting Principle | Dec. 31, 2013 Change in Accounting Method for Inventory Valuation Effect of Change in Accounting Principle | Dec. 31, 2012 Change in Accounting Method for Inventory Valuation Effect of Change in Accounting Principle | Sep. 30, 2014 Pro Forma Effect Had Inventory Change Not Been Made Change in Accounting Method for Inventory Valuation | Sep. 30, 2014 Pro Forma Effect Had Inventory Change Not Been Made Change in Accounting Method for Inventory Valuation | Sep. 30, 2013 As Previously Reported (under LIFO) | Sep. 30, 2013 As Previously Reported (under LIFO) | Dec. 31, 2013 As Previously Reported (under LIFO)
Consolidated Statements of Income and Comprehensive Income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of sales | $ (1,198,607) |  | $ (617,841) | $ (3,486,108) |  | $ (1,792,782) |  | $ 822 | $ 6,503 |  |  |  |  | $ (618,663) | [1] | $ (1,799,285) | [1] |
Gross profit | 320,333 |  | 227,599 | 932,545 |  | 608,095 |  | 822 | 6,503 |  |  |  |  | 226,777 | [1] | 601,592 | [1] |
Income from operations | 188,378 | [2] | 142,782 | 529,534 | [2] | 358,979 |  | 822 | 6,503 |  |  |  |  | 141,960 | [1] | 352,476 | [1] |
Income before taxes | 165,267 | [2] | 130,932 | 464,223 | [2] | 328,646 |  | 822 | 6,503 |  |  |  |  | 130,110 | [1] | 322,143 | [1] |
Provision for income taxes | (60,822) |  | (46,250) | (170,135) |  | (115,418) |  | (320) | (2,533) |  |  |  |  | (45,930) | [1] | (112,885) | [1] |
Net income | 104,445 |  | 84,682 | 294,088 |  | 213,228 |  | 502 | 3,970 |  |  | 1,700 | 1,500 | 84,180 | [1] | 209,258 | [1] |
Comprehensive income | 104,831 |  | 93,902 | 298,168 |  | 241,176 |  | 502 | 3,970 |  |  |  |  | 93,400 | [1] | 237,206 | [1] |
Net income per common share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic (in dollars per share) | $ 1.06 |  | $ 0.88 | $ 2.99 |  | $ 2.21 |  | $ 0.01 | $ 0.04 |  |  |  |  | $ 0.87 | [1] | $ 2.17 | [1] |
Diluted (in dollars per share) | $ 1.06 |  | $ 0.87 | $ 2.99 |  | $ 2.19 |  | $ 0.01 | $ 0.04 |  |  |  |  | $ 0.86 | [1] | $ 2.15 | [1] |
Consolidated Balance Sheet |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Inventories | 616,962 |  |  | 616,962 |  |  | 594,291 |  |  | 71,768 |  | (69,300) | (69,300) |  |  |  |  | 522,523
Deferred income tax assets | 32,280 |  |  | 32,280 |  |  | 47,616 |  |  | (27,963) |  |  |  |  |  |  |  | 75,579
Retained earnings | 1,184,155 |  |  | 1,184,155 |  |  | 1,019,101 |  |  | 43,805 | 38,800 |  |  |  |  |  |  | 975,296
Consolidated Statement of Cash Flows |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | 104,445 |  | 84,682 | 294,088 |  | 213,228 |  | 502 | 3,970 |  |  | 1,700 | 1,500 | 84,180 | [1] | 209,258 | [1] |
Deferred income tax provision |  |  |  | 17,427 |  | 6,137 |  |  | 2,533 |  |  |  |  |  |  | 3,604 |  |
Inventories |  |  |  | $ (22,520) |  | $ (4,628) |  |  | $ (6,503) |  |  |  |  |  |  | $ 1,875 |  |
[1] | Certain amounts in prior periods' consolidated financial statements have been reclassified to conform with the current period presentation.
[2] | On October 25, 2013, we acquired Boise. The 2014 results include Boise for the full period.

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