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Share-based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block] | The following table summarizes the Company’s unvested restricted stock and restricted stock unit awards activity:
| December 31, 2013
| Number of Shares |  | Weighted-Average Grant-Date Fair Value
Unvested at beginning of year | 132 |  |  | $ | 36.60 |
Granted | 49 |  |  | 69.72 |
Forfeited | (2 | ) |  | 56.06 |
Vested | (82 | ) |  | 26.61 |
Unvested at end of year | 97 |  |  | $ | 61.48 |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] | Weighted-average grant-date fair values of stock options and the assumptions used in estimating the fair values are as follows:
| Year Ended December 31,
| 2013 |  | 2012 |  | 2011
Weighted-average grant-date fair value per share | $ | 41.52 |  |  | $ | 35.69 |  |  | $ | 24.33 |
Expected term (years) | 6.25 |  |  | 6.25 |  |  | 6.25 |
Risk-free interest rate | 1.00 | % |  | 1.15 | % |  | 2.43 | %
Expected volatility | 66.80 | % |  | 70.71 | % |  | 72.47 | %
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value | The following table summarizes the Company’s stock option activity:
| December 31, 2013
| Number of Shares |  | Weighted-average Exercise Price |  | Aggregate Intrinsic Value |  | Weighted- average Remaining Contractual Term
Outstanding at beginning of year | 749 |  |  | $ | 24.21 |  |  |  |  |
Granted | 82 |  |  | 68.21 |  |  |  |  |
Exercised | (315 | ) |  | 16.97 |  |  |  |  |
Forfeited | (6 | ) |  | 43.17 |  |  |  |  |
Outstanding at end of year | 510 |  |  | $ | 35.54 |  |  | $ | 30,676 |  |  | 6.5 years
Vested and expected to vest at end of year | 504 |  |  | $ | 35.27 |  |  | $ | 30,446 |  |  | 6.5 years
Exercisable at end of year | 236 |  |  | $ | 21.61 |  |  | $ | 17,460 |  |  | 5.1 years
Performance Based Stock Awards [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule of Share-based Compensation, Activity [Table Text Block] | The following table summarizes the Company’s performance unit awards activity:
| December 31, 2013
| Number of Shares |  | Weighted-Average Grant-Date Fair Value
Unvested at beginning of year | 68 |  |  | $ | 41.07 |
Granted | 19 |  |  | 68.21 |
Forfeited | (1 | ) |  | 36.45 |
Unvested at end of year | 86 |  |  | $ | 46.94 |
Leveraged Restricted Stock Awards [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule of Share-based Compensation, Activity [Table Text Block] | The following table summarizes the Company’s leveraged restricted share unit awards activity:
| December 31, 2013
| Number of Shares |  | Weighted-average Grant-Date Fair Value
Unvested at beginning of year | 18 |  |  | $ | 67.05 |
Granted | 22 |  |  | 80.34 |
Unvested at end of year | 40 |  |  | $ | 74.36 |

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- Definition Tabular disclosure of share-based compensation plans that may be presented in a single table for outstanding, vested and expected to vest, and exercisable awards. The information that may be disclosed in this table may include, but is not limited to, number of shares, weighted average exercise price, weighted average remaining contractual life, and aggregate intrinsic value. + References No definition available. + Details
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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited 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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- 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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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + 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 (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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