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Share-Based Compensation: (Tables) | 9 Months Ended
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Sep. 30, 2012
Share-Based Compensation: |
Stock Option Activity |
|  |  |  |  |  |  |  |  |  | Weighted |  | Weighted |  |  |
|  |  |  |  |  | 1998 |  |  |  | Average |  | Average |  | Aggregate |
|  | 2007 |  | 1998 |  | Director |  | Total |  | Exercise |  | Contractual |  | Intrinsic |
|  | Plan |  | Plan |  | Plan |  | Shares |  | Price |  | Life |  | Value |
Outstanding, January 1, 2012 |  | 1,329 |  | 572 |  | 195 |  | 2,096 |  | $ | 20.11 |  |  |  |  |
Granted |  | 111 |  | — |  | — |  | 111 |  | $ | 23.74 |  |  |  |  |
Exercised |  | (430 | ) | (190 | ) | (49 | ) | (669 | ) | $ | 17.54 |  |  |  |  |
Forfeited and expired |  | (5 | ) | (78 | ) | — |  | (83 | ) | $ | 25.14 |  |  |  |  |
Outstanding, September 30, 2012 |  | 1,005 |  | 304 |  | 146 |  | 1,455 |  | $ | 21.29 |  | 5.6 |  | $ | 1,821 |
Exercisable, September 30, 2012 |  | 551 |  | 304 |  | 146 |  | 1,001 |  | $ | 21.61 |  | 4.5 |  | $ | 1,362 |
Non-Vested Restricted Stock Unit Activity |
|  | 2007 |  |  |
|  | Plan |  | Weighted |
|  | Restricted |  | Average |
|  | Stock |  | Grant-Date |
|  | Units |  | Fair Value |
Outstanding, January 1, 2012 |  | 394 |  | $ | 18.45 |
Granted |  | 218 |  | $ | 18.11 |
Vested |  | (154 | ) | $ | 16.57 |
Canceled |  | (106 | ) | $ | 20.62 |
Outstanding, September 30, 2012 |  | 352 |  | $ | 18.41 |
Summary of Compensation Cost and Other Measures Related to Share-Based Payments |
|  | Three Months Ended |  | Nine Months Ended |
|  | September 30, |  | September 30, |
|  | 2012 |  | 2011 |  | 2012 |  | 2011 |
Share-based expense (net of estimated forfeitures): |  |  |  |  |  |  |  |  |
Stock options |  | $ | 0.2 |  | $ | 0.2 |  | $ | 0.6 |  | $ | 0.6 |
Non-vested stock/Restricted stock units |  | 0.9 |  | 0.5 |  | 2.3 |  | 1.4 |
Total share-based expense |  | 1.1 |  | 0.7 |  | 2.9 |  | 2.0 |
Total recognized tax benefit |  | (0.4 | ) | (0.3 | ) | (1.2 | ) | (0.8 | )
Share-based expense (net of tax) |  | $ | 0.7 |  | $ | 0.4 |  | $ | 1.7 |  | $ | 1.2 |

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- Definition Tabular disclosure of the amount of total share-based compensation cost, including the amounts attributable to each share-based compensation plan and any related tax benefits. + 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 (h)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock units. + 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 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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