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Income Taxes (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Income Tax Disclosure [Abstract] |  |  |
United States | $ 234,646 | $ 203,269 | $ 178,497
Foreign | 6,732 | 4,881 | 2,888
Total | 241,378 | 208,150 | 181,385
Current [Abstract] |  |  |
Federal | 77,000 | 65,676 | 54,447
State and other | 12,182 | 10,263 | 9,126
Current tax | 89,182 | 75,939 | 63,573
Deferred [Abstract] |  |  |
Federal | 4,079 | 4,568 | 6,942
State and other | (330) | (370) | 44
Deferred tax | 3,749 | 4,198 | 6,986
Total | $ 92,931 | $ 80,137 | $ 70,559
Reconciliation of U.S. federal statutory tax rate to effective tax rate [Abstract] |  |  |
Federal statutory rate (in hundredths) | 35.00% | 35.00% | 35.00%
Change in valuation allowance (in hundredths) | 0.10% | 0.20% | 0.43%
Other, primarily state income tax rate (in hundredths) | 3.40% | 3.30% | 3.47%
Total effective tax rate (in hundredths) | 38.50% | 38.50% | 38.90%
Deferred tax assets [Abstract] |  |  |
Product inventories | $ 7,010 | $ 7,101 |
Accrued expenses | 3,978 | 3,303 |
Allowance for doubtful accounts | 396 | 606 |
Total current | 11,384 | 11,010 |
Component reclassified for net presentation | (5,368) | (5,480) |
Total current, net | 6,016 | 5,530 |
Leases | 1,920 | 1,786 |
Share-based compensation | 13,778 | 13,422 |
Uncertain tax positions | 2,746 | 2,092 |
Net operating losses | 5,735 | 5,485 |
Interest rate swaps | 674 | 1,513 |
Other | 2,465 | 1,159 |
Total noncurrent | 27,318 | 25,457 |
Less: Valuation allowance, non-current | (5,735) | (5,485) |
Component reclassified for net presentation | (20,781) | (18,755) |
Total non-current, net | 802 | 1,217 |
Total deferred tax assets | 6,818 | 6,747 |
Deferred tax liabilities [Abstract] |  |  |
Trade discounts on purchases | 2,698 | 3,001 |
Prepaid expenses | 2,670 | 2,479 |
Total current | 5,368 | 5,480 |
Component reclassified for net presentation | (5,368) | (5,480) |
Total current, net | 0 | 0 |
Intangible assets, primarily goodwill | 42,930 | 40,197 |
Depreciation | 12,326 | 8,366 |
Total non-current | 55,256 | 48,563 |
Component reclassified for net presentation | (20,781) | (18,755) |
Total non-current, net | 34,475 | 29,808 |
Deferred Tax Liabilities, Gross | 34,475 | 29,808 |
Net deferred tax liability | 27,657 | 23,061 |
Loss Carryforwards [Line Items] |  |  |
Excess Tax Benefit (Tax Deficiency) from Share-based Compensation, Financing Activities | 7,370 | 7,706 | $ 5,524
Uncertain tax positions activity [Roll Forward] |  |  |
Beginning balance | 5,978 | 4,690 | 3,837
Increases for tax positions taken during a prior period | 10 | 410 | 0
Increases for tax positions taken during the current period | 2,819 | 1,782 | 1,664
Decreases resulting from the expiration of the statute of limitations | 961 | 904 | 811
Decreases relating to settlements | 0 | 0 | 0
Ending balance | 7,846 | 5,978 | $ 4,690
Unrecognized tax benefits that, if recognized, would decrease the effective tax rate | 5,100 | 3,886 |
Interest expense related to unrecognized tax benefits | 156 | 136 |
Accrued interest on unrecognized tax benefits | 685 | 529 |
International Subsidiaries [Member] |  |  |
Loss Carryforwards [Line Items] |  |  |
Tax loss carry-forwards | 22,158 |  |
Deferred tax asset, valuation allowance | $ 5,735 | $ 5,485 |

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