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Equity Incentive Plan (Tables) | 12 Months Ended
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Dec. 31, 2013
EQUITY INCENTIVE PLAN [Abstract] |
Schedule of Stock Options, Activity |
| Number of Options |  | Weighted Average Exercise Price |  | Aggregate Intrinsic Value (in millions)
Outstanding at December 31, 2012 | 2,104,775 |  |  | $94.45 |  | $208.9
Granted | 135,858 |  |  | 244.99 |  |
Exercised | (352,602 | ) |  | 56.00 |  |
Forfeited | (16,337 | ) |  | 115.04 |  |
Outstanding at December 31, 2013 | 1,871,694 |  |  | $112.57 |  | $243.7
Options exercisable at December 31, 2013 | 1,377,919 |  |  | $90.35 |  | $209.8
Schedule Shares Outstanding under Stock Option Plans, by Exercise Price Range |
Number of Options Outstanding |  | Weighted Average Exercise Price |  | Remaining Contractual Life of Options Outstanding |  | Options Exercisable
84,157 |  |  | $ | 46.32 |  |  | 1.0 |  | 84,157 |
339,250 |  |  | $ | 61.57 |  |  | 2.8 |  | 339,250 |
472,789 |  |  | $ | 81.31 |  |  | 5.3 |  | 433,569 |
298,050 |  |  | $ | 108.90 |  |  | 3.9 |  | 298,050 |
359,084 |  |  | $ | 141.51 |  |  | 7.3 |  | 181,965 |
318,364 |  |  | $ | 201.64 |  |  | 9.3 |  | 40,928 |
1,871,694 |  |  |  |  |  | 5.5 |  | 1,377,919 |
Schedule of Stock Options, Valuation Assumptions |
| 2013 |  | 2012 |  | 2011
Risk-free interest rate | 1.31 | % |  | 0.71 | % |  | 1.09 | %
Expected life in years | 5 |  |  | 5 |  |  | 5 |
Expected volatility | 28 | % |  | 30 | % |  | 30 | %
Expected dividend yield | — |  |  | — |  |  | — |
Schedule Restricted Stock Units, Activity |
| Number of Restricted Stock Units |  | Aggregate Intrinsic Value (in millions)
Outstanding at December 31, 2012 | 131,025 |  |  | $ | 25.3 |
Granted | 29,507 |  |  |  |
Vested | (46,044 | ) |  |  |
Forfeited | (6,706 | ) |  |  |
Outstanding at December 31, 2013 | 107,782 |  |  | $ | 26.1 |

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- Definition Tabular disclosure of the changes in outstanding nonvested shares. + 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)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -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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