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Income Taxes (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Income Taxes [Abstract] |  |  |
United States | $ 111,376,000 | $ 92,108,000 | $ 76,941,000
Foreign | 5,727,000 | 2,518,000 | 1,832,000
Total | 117,103,000 | 94,626,000 | 78,773,000
Current [Abstract] |  |  |
Federal | 32,850,000 | 29,040,000 | 24,422,000
State and other | 7,675,000 | 5,682,000 | 4,998,000
Current tax | 40,525,000 | 34,722,000 | 29,420,000
Deferred [Abstract] |  |  |
Federal | 4,754,000 | 1,715,000 | 1,659,000
State and other | 40,000 | 656,000 | (122,000)
Deferred tax | 4,794,000 | 2,371,000 | 1,537,000
Total | 45,319,000 | 37,093,000 | 30,957,000
Reconciliation of U.S. federal statutory tax rate to effective tax rate [Abstract] |  |  |
Federal statutory rate (in hundredths) | 35.00% | 35.00% | 35.00%
Other, primarily state income tax rate (in hundredths) | 3.70% | 4.20% | 4.30%
Total effective tax rate (in hundredths) | 38.70% | 39.20% | 39.30%
Reduction in deferred tax liability |  |  | 1,400,000
Deferred tax assets [Abstract] |  |  |
Product inventories | 8,075,000 | 8,085,000 |
Accrued expenses | 2,885,000 | 1,272,000 |
Allowance for doubtful accounts | 777,000 | 854,000 |
Total current | 11,737,000 | 10,211,000 |
Leases | 1,866,000 | 1,676,000 |
Share-based compensation | 17,740,000 | 17,321,000 |
Uncertain tax positions | 1,650,000 | 1,387,000 |
Net operating losses | 3,972,000 | 3,537,000 |
Interest rate swaps | 164,000 | 1,316,000 |
Equity losses in unconsolidated investments | 5,653,000 | 5,653,000 |
Other | 1,037,000 | 1,079,000 |
Total noncurrent | 32,082,000 | 31,969,000 |
Less: Valuation allowance | 9,625,000 | 9,190,000 |
Total non-current | 22,457,000 | 22,779,000 |
Total deferred tax assets | 34,194,000 | 32,990,000 |
Deferred tax liabilities [Abstract] |  |  |
Trade discounts on purchases | 1,944,000 | 2,159,000 |
Prepaid expenses | 1,032,000 | 1,067,000 |
Total current | 2,976,000 | 3,226,000 |
Intangible assets, primarily goodwill | 27,108,000 | 24,330,000 |
Depreciation | 5,885,000 | 1,263,000 |
Total non-current | 32,993,000 | 25,593,000 |
Total deferred tax liabilities | 35,969,000 | 28,819,000 |
Net deferred tax asset | (1,775,000) | 4,171,000 |
Operating Loss Carryforwards [Line Items] |  |  |
Deferred tax asset, valuation allowance | (9,625,000) | (9,190,000) |
Uncertain tax positions activity [Roll Forward] |  |  |
Beginning balance | 3,962,000 | 4,550,000 | 3,887,000
Increases for tax positions taken during a prior period | 0 | 114,000 | 579,000
Increases for tax positions taken during the current period | 914,000 | 811,000 | 898,000
Decreases resulting from the expiration of the statute of limitations | (46,000) | (992,000) | (814,000)
Decreases relating to settlements | (115,000) | (521,000) | 0
Ending balance | 4,715,000 | 3,962,000 | 4,550,000
Unrecognized tax benefits that, if recognized, would decrease the effective tax rate | 3,000,000 | 2,600,000 |
Interest expense related to unrecognized tax benefits | 300,000 | 100,000 |
Accrued interest on unrecognized tax benefits | 800,000 | 500,000 |
Investment in LAC [Member] |  |  |
Deferred tax assets [Abstract] |  |  |
Less: Valuation allowance | (5,700,000) |  |
Operating Loss Carryforwards [Line Items] |  |  |
Deferred tax asset, valuation allowance | 5,700,000 |  |
International Subsidiaries [Member] |  |  |
Deferred tax assets [Abstract] |  |  |
Less: Valuation allowance | (4,000,000) | (3,500,000) |
Operating Loss Carryforwards [Line Items] |  |  |
Tax loss carry-forwards | 13,100,000 |  |
Operating loss carry-forwards, valuation allowance, | 4,000,000 | 3,500,000 |
Deferred tax asset, valuation allowance | 4,000,000 | 3,500,000 |
Excess tax benefits on exercise of nonqualified stock options and lapse of restrictions on restricted stock awards | $ 3,100,000 | $ 1,900,000 |

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