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Stock Option Plan and Stock Grants (Tables) | 12 Months Ended
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Dec. 31, 2013
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block] |
| Number of Shares | Weighted Average Grant Date Fair Value
Balance at December 31, 2010 | 104,686 |  | $ | 18.61 |
Shares granted | 239,330 |  | 28.75
Shares canceled/forfeited | (22,666 | ) | 28.70
Shares vested | (227,330 | ) | 24.50
Balance at December 31, 2011 | 94,020 |  | 27.75
Shares granted | 214,664 |  | 35.06
Shares canceled/forfeited | (36,666 | ) | 35.07
Shares vested | (177,998 | ) | 32.30
Balance at December 31, 2012 | 94,020 |  | 32.97
Shares granted | 173,332 |  | 37.32
Shares vested | (167,564 | ) | 34.97
Balance at December 31, 2013 | 99,788 |  | 37.17
Summary of Stock Option Activity | A summary of our stock option activity, and related information for the years ended December 31, 2013, 2012, and 2011 follows:
|  | Shares Subject To Options |  | Weighted Average Exercise Price Per Share |  | Weighted Average Outstanding Contractual Life (in years)
Balance at December 31, 2010 |  | 1,610,368 |  |  | $ | 20.16 |  |  | 4.9
Options canceled |  | (344,768 | ) |  | 13.14 |  |  |
Balance at December 31, 2011 |  | 1,265,600 |  |  | 22.07 |  |  | 4.9
Options exercised |  | (160,000 | ) |  | 24.10 |  |  |
Balance at December 31, 2012 |  | 1,105,600 |  |  | 21.78 |  |  | 4.0
Options exercised |  | (20,000 | ) |  | 12.34 |  |  |
Balance at December 31, 2013 |  | 1,085,600 |  |  | 21.95 |  |  | 3.1
Exercisable at December 31, 2013 |  | 1,085,600 |  |  | 21.95 |  |  | 3.1

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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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