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Stock Incentive Plans and Stock Purchase Plan: (Tables) | 12 Months Ended
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Dec. 31, 2012
Schedule of Weighted Average Grant-Date Fair Values | The activity related to the Company’s restricted and deferred stock awards and the corresponding weighted average grant-date fair values for the year ended December 31, 2012 are as follows:
|  | Number of Shares |  |  | Weighted Average Fair Value |
Non-vested shares at January 1, 2012 |  |  | 978,353 |  |  | $ | 59.64 |
Awarded |  |  | 465,317 |  |  | $ | 60.11 |
Forfeited |  |  | (39,441 | ) |  | $ | 65.06 |
Vested |  |  | (423,331 | ) |  | $ | 54.30 |
Non-vested shares at December 31, 2012 |  |  | 980,898 |  |  | $ | 61.94 |
Schedule of Weighted Average Assumptions for Expected Volatility, Expected Life, Risk-Free Interest Rate and Dividend Yield |
|  | Years Ended December 31,
|  | 2011 |  | 2010
Expected volatility |  | 35% |  | 35%
Expected life—officers (in years) |  | 4.5 |  | 4.5
Expected life—other employees (in years) |  | 3.5 |  | 3.5
Risk-free interest rate |  | 1.9% |  | 2.1% to 2.3%
Dividend yield |  | 0% |  | 0%
Schedule of Activity and Certain Other Information Related to Stock Option Awards | The activity and certain other information related to the Company’s stock option awards for the year ended December 31, 2012 are as follows:
|  | Number of Shares |  |  | Weighted Average Exercise Price |  |  | Weighted Average Remaining Contractual Term (in years) |  |  | Aggregate Intrinsic Value (in millions) |
Outstanding at January 1, 2012 |  |  | 2,053,573 |  |  | $ | 45.10 |  |  |  |  |  |  |  |  |
Granted |  |  | — |  |  |  | — |  |  |  |  |  |  |  |  |
Canceled |  |  | (5,794 | ) |  | $ | 68.56 |  |  |  |  |  |  |  |  |
Exercised |  |  | (528,135 | ) |  | $ | 39.33 |  |  |  |  |  |  | $ | 18.1 |
Outstanding at December 31, 2012 |  |  | 1,519,644 |  |  | $ | 47.02 |  |  |  | 4.1 |  |  | $ | 49.4 |
Exercisable at December 31, 2012 |  |  | 1,474,539 |  |  | $ | 46.46 |  |  |  | 3.9 |  |  | $ | 48.8 |

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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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- Definition Tabular disclosure of the weighted-average grant-date fair value of equity options or other equity instruments granted 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 (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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