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Financial Statement Information - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Dec. 01, 2016
Net Cash Provided by (Used in) Financing Activities |  |  | $ (347,063) | $ 1,088,482 |  |  |  |
Equity Method Investments | $ 199,246 |  | 199,246 |  |  |  | $ 183,467 |
Depreciation | $ 34,000 | $ 30,000 | $ 93,000 | $ 84,000 |  |  |  |
Net income (1) | $ 0.39 | $ 0.40 | $ 1.32 | $ 1.22 |  |  |  |
Net Income | $ 122,381 | $ 122,688 | $ 409,573 | $ 377,644 |  |  |  |
Schedule of Finite-Lived Intangible Assets |  |  | The components of other intangibles are as follows (in thousands):
| September 30, 2017 |  | December 31, 2016
| Gross Carrying Amount |  | Accumulated Amortization |  | Net |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net
Trade names and trademarks | $ | 328,914 |  |  | $ | (69,824 | ) |  | $ | 259,090 |  |  | $ | 286,008 |  |  | $ | (51,104 | ) |  | $ | 234,904 |
Customer and supplier relationships | 441,182 |  |  | (148,499 | ) |  | 292,683 |  |  | 395,284 |  |  | (92,079 | ) |  | 303,205 |
Software and other technology related assets | 101,646 |  |  | (54,688 | ) |  | 46,958 |  |  | 77,329 |  |  | (35,648 | ) |  | 41,681 |
Covenants not to compete | 12,838 |  |  | (9,145 | ) |  | 3,693 |  |  | 11,726 |  |  | (7,285 | ) |  | 4,441 |
| $ | 884,580 |  |  | $ | (282,156 | ) |  | $ | 602,424 |  |  | $ | 770,347 |  |  | $ | (186,116 | ) |  | $ | 584,231 |
Goodwill | 3,392,363 |  | $ 3,392,363 |  |  |  | 3,054,769 |
Reserve for estimated returns, discounts and allowances | (42,000) |  | (42,000) |  |  |  | (38,000) |
Reserve for uncollectible accounts | 56,000 |  | 56,000 |  |  |  | 46,000 |
Finite-lived intangible assets, gross | 884,580 |  | 884,580 |  |  |  | 770,347 |
Amortization of Intangible Assets | 26,000 | $ 25,000 | 74,000 | $ 58,000 |  |  |  |
Estimated annual amortization expense in year two | 89,000 |  | 89,000 |  |  |  |  |
Estimated annual amortization expense in year three | 74,000 |  | 74,000 |  |  |  |  |
Estimated annual amortization expense in year five | $ 26,000 |  | $ 26,000 |  |  |  |  |
Net income (1) | $ 0.40 | $ 0.40 | $ 1.33 | $ 1.23 |  |  |  |
Retained earnings | $ 2,999,932 |  | $ 2,999,932 |  |  |  | 2,590,359 |
Equity in earnings (loss) of unconsolidated subsidiaries | 2,673 | $ 29 | 3,878 | $ (519) |  |  |  |
PGW |  |  |  |  |  |  |  |
Goodwill |  |  |  |  | $ 208,000 |  | 205,058 |
Rhiag |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  | $ 591,000 | $ 585,415 |
Mekonomen |  |  |  |  |  |  |  |
Equity Method Investments | $ 193,000 |  | $ 193,000 |  |  |  |  | $ 0
Equity Method Investment, Ownership Percentage | 2650.00% |  | 2650.00% |  |  |  |  |
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity | $ 123,000 |  | $ 123,000 |  |  |  |  |
Equity in earnings (loss) of unconsolidated subsidiaries | 3,000 |  | 5,000 |  |  |  |  |
Equity Method Investments, Fair Value Disclosure | $ 216,000 |  | $ 216,000 |  |  |  |  |

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