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Shared Based Awards (Tables) | 12 Months Ended
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Dec. 31, 2012
Share Based Awards [Abstract] |
Exercised Options Data [Table Text Block] |
|  | Year ended December 31,
|  | 2012 |  | 2011 |  | 2010
Intrinsic value of options exercised |  | $ | 12,211 |  |  | $ | 11,451 |  |  | $ | 4,422 |
Cash received from exercise of stock options |  | $ | 14,844 |  |  | $ | 7,974 |  |  | $ | 2,517 |
Tax benefit from stock option exercises |  | $ | 4,567 |  |  | $ | 4,288 |  |  | $ | 1,680 |
Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block] |
|  | Number of Units |  | Weighted Average Contractual Life (Years) |  | Aggregate Intrinsic Value
Non-vested at December 31, 2011 |  | — |  |  |  |  |
Granted |  | 37,310 |  |  |  |  |
Vested |  | — |  |  |  |  |
Forfeited |  | — |  |  |  |  |
Non-vested and expected to vest at December 31, 2012 |  | 37,310 |  |  | 1.0 |  | $ | 2,273 |
Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan [Table Text Block] |
|  | Year ended December 31,
|  | 2012 |  | 2011 |  | 2010
Stock compensation expense |  | $ | 5,563 |  |  | $ | 4,016 |  |  | $ | 3,471 |
Tax benefit from stock-based compensation cost |  | 1,922 |  |  | 1,376 |  |  | 1,153 |
Indirect tax benefit |  | 209 |  |  | 785 |  |  | 438 |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | Year ended December 31,
|  | 2012 |  | 2011 |  | 2010
Number of options granted |  | 228,328 |  |  | 290,000 |  |  | 243,000 |
Grant date fair value of options granted (in thousands) |  | $ | 3,158 |  |  | $ | 4,090 |  |  | $ | 2,474 |
Weighted average assumptions for stock option valuation: |  |  |  |  |  |
Expected term (years) |  | 4.7 |  |  | 5.0 |  |  | 3.4 |
Expected stock price volatility |  | 33.6 | % |  | 34.5 | % |  | 40.2 | %
Risk-free interest rate |  | 0.7 | % |  | 1.7 | % |  | 0.8 | %
Expected dividend yield |  | — | % |  | — | % |  | — | %
Weighted average grant price per option |  | $ | 47.12 |  |  | $ | 43.27 |  |  | $ | 34.70 |
Weighted average grant date fair value per option |  | $ | 13.83 |  |  | $ | 14.10 |  |  | $ | 10.18 |
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] | A summary of our stock option activity as of and for the year ended December 31, 2012 is as follows:
|  | Shares |  | Weighted Average Exercise Price Per Share |  | Weighted Average Contractual Life (Years) |  | Aggregate Intrinsic Value
Outstanding at December 31, 2011 |  | 2,745,428 |  |  | $ | 33.28 |  |  |  |  |
Granted |  | 228,328 |  |  | $ | 47.12 |  |  |  |  |
Exercised |  | (526,040 | ) |  | $ | 28.22 |  |  |  |  |
Forfeited or expired |  | (2,963 | ) |  | $ | 34.12 |  |  |  |  |
Outstanding at December 31, 2012 |  | 2,444,753 |  |  | $ | 35.66 |  |  | 4.7 |  | $ | 61,778 |
Exercisable at December 31, 2012 |  | 1,670,325 |  |  | $ | 34.66 |  |  | 3.5 |  | $ | 43,873 |
Vested or expected to vest, December 31, 2012 |  | 2,444,753 |  |  | $ | 35.66 |  |  | 4.7 |  | $ | 61,778 |
Schedule of Share-based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions [Table Text Block] |
|  | Year ended December 31,
|  | 2012 |  | 2011 |  | 2010
ESPP shares purchased by employees |  | 61,004 |  |  | 57,643 |  |  | 53,739 |
Intrinsic value of ESPP purchases (in thousands) |  | $ | 913 |  |  | $ | 530 |  |  | $ | 278 |
Weighted average assumptions for ESPP valuation: |  |  |  |  |  |
Expected term (in years) |  | 0.5 |  |  | 0.5 |  |  | 0.5 |
Expected stock price volatility |  | 23.6 | % |  | 26.0 | % |  | 26.5 | %
Risk-free interest rate |  | 0.1 | % |  | 0.4 | % |  | 0.2 | %
Expected dividend yield |  | — | % |  | — | % |  | — | %

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