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Schedule of Stock-Based Compensation Expense Included in Statements of Income (Details) (USD $)
In Thousands, unless otherwise specified |
3 Months Ended | 9 Months Ended | 12 Months Ended | ||||
|---|---|---|---|---|---|---|---|
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Sep. 30, 2013
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Sep. 30, 2012
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Sep. 30, 2013
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Sep. 30, 2012
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2010
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| Employee Service Share-based Compensation, Allocation of Recognized Period Costs | |||||||
| Stock-based compensation expense, before tax | $ 5,730 | $ 3,998 | $ 16,292 | $ 11,976 | $ 15,634 | $ 13,107 | $ 9,974 |
| Income tax benefit | (2,235) | (1,559) | (6,354) | (4,671) | (6,097) | (5,059) | (3,920) |
| Total stock-based compensation expense, net of tax | 3,495 | 2,439 | 9,938 | 7,305 | 9,537 | 8,048 | 6,054 |
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Cost of goods sold
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| Employee Service Share-based Compensation, Allocation of Recognized Period Costs | |||||||
| Stock-based compensation expense, before tax | 98 | 99 | 294 | 298 | 376 | 327 | 278 |
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Facility and warehouse expenses
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| Employee Service Share-based Compensation, Allocation of Recognized Period Costs | |||||||
| Stock-based compensation expense, before tax | 687 | 648 | 2,058 | 1,951 | 2,465 | 2,391 | 2,069 |
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Selling, general and administrative expenses
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| Employee Service Share-based Compensation, Allocation of Recognized Period Costs | |||||||
| Stock-based compensation expense, before tax | $ 4,945 | $ 3,251 | $ 13,940 | $ 9,727 | $ 12,793 | $ 10,389 | $ 7,627 |