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Stock Based Compensation (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Options |  |  |
Options outstanding at beginning of year (shares) | 897,767 | 1,332,767 | 1,620,167
Granted (shares) | 0 | 0 | 0
Exercised (shares) | (282,082) | (171,800) | (133,400)
Cancelled (shares) | (6,100) | (263,200) | (154,000)
Outstanding at end of year (shares) | 609,585 | 897,767 | 1,332,767
Weighted Average Exercise Price |  |  |
Options outstanding at beginning of year (shares) | $ 23.56 | $ 23.80 | $ 23.19
Exercised (shares) | $ 15.12 | $ 15.21 | $ 15.46
Cancelled (shares) | $ 25.73 | $ 30.24 | $ 24.58
Outstanding at end of year (shares) | $ 27.44 | $ 23.56 | $ 23.80
Options outstanding at end of year, additional disclosures |  |  |
Weighted Average Remaining Contractual Life | 1 year 10 months 13 days |  |
Aggregate Intrinsic Value | $ 7,376 |  |
Vested and expected to vest at end of year |  |  |
Vested and expected to vest at end of year (shares) | 608,405 |  |
Weighted Average Exercise Price (shares) | $ 27.47 |  |
Weighted Average Remaining Contractual Life | 1 year 10 months 13 days |  |
Aggregate Intrinsic Value | 7,350 |  |
Exercisable at end of year |  |  |
Options (shares) | 471,760 | 550,359 | 740,376
Weighted Average Exercise Price (shares) | $ 30.93 | $ 26.29 | $ 26.79
Weighted Average Remaining Contractual Life | 1 year 7 months 17 days |  |
Aggregate Intrinsic Value | $ 4,363 |  |
Price range of options exercised - lower range limit | $ 8.06 | $ 8.06 | $ 8.06
Price range of options exercised - upper range limit | $ 34.30 | $ 21.10 | $ 21.10
Price range of options outstanding - lower range limit | $ 8.06 | $ 8.06 | $ 8.06
Price range of options outstanding - upper range limit | $ 44.44 | $ 44.44 | $ 44.44
Total shares reserved for existing or future grants at end of year | 1,997,382 |  |

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