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Share-based compensation (Details 2) (USD $) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2012 | Jun. 30, 2011 | Jun. 30, 2012 | Jun. 30, 2011 | Dec. 31, 2011
Share-based compensation |  |  |  |  |
Share-based compensation expense (in dollars) | $ 1,700,000 | $ 500,000 | $ 3,500,000 | $ 1,700,000 |
Income tax benefit (in dollars) | 600,000 | 100,000 | 1,200,000 | 500,000 |
Nonqualified stock options (NQSOs) |  |  |  |  |
Share-based compensation |  |  |  |  |
Outstanding shares (in shares) |  |  |  |  | 55,500
Weighted-average exercise price (in dollars per share) |  |  |  |  | $ 20.92
Aggregate intrinsic value (in dollars) | 200,000 |  | 200,000 |  |
Shares exercised | 21,500 | 69,500 | 33,500 | 102,000 |
Weighted-average exercise price (in dollars per share) | $ 20.93 | $ 21.07 | $ 21.20 | $ 20.82 |
Cash received from exercise (in dollars) | 450,000 | 1,465,000 | 710,000 | 2,123,000 |
Intrinsic value of shares exercised (in dollars) | 174,000 | 581,000 | 265,000 | 840,000 |
Tax benefit realized for the deduction of exercises (in dollars) | 68,000 | 170,000 | 103,000 | 271,000 |
Nonqualified stock options (NQSOs) | 2003 |  |  |  |  |
Share-based compensation |  |  |  |  |
Range of exercise prices (in dollars per share) |  |  | $ 20.49 |  |
Number of options (in shares) | 22,000 |  | 22,000 |  |
Weighted-average remaining contractual life (in years) | 0.7 |  | 0.7 |  |
Weighted-average exercise price of options outstanding and exercisable (in dollars per share) | $ 20.49 |  | $ 20.49 |  |
Stock appreciation rights (SARs) |  |  |  |  |
Share-based compensation |  |  |  |  |
Lower range of exercise prices (in dollars per share) |  |  | $ 26.02 |  |
Upper range of exercise prices (in dollars per share) |  |  | $ 26.18 |  |
Number of options (in shares) | 170,000 |  | 170,000 |  |
Weighted-average remaining contractual life (in years) | 2.4 |  | 2.4 |  |
Weighted-average exercise price of shares outstanding and exercisable (in dollars per share) | $ 26.12 |  | $ 26.12 |  |
Outstanding shares (in shares) |  |  |  |  | 282,000
Weighted-average exercise price (in dollars per share) |  |  |  |  | $ 26.14
Aggregate intrinsic value (in dollars) | 500,000 |  | 500,000 |  |
Shares underlying SARS expired (in shares) |  | 4,000 |  | 40,000 |
Weighted-average price of shares expired (in dollars per share) |  | $ 26.18 |  | $ 26.11 |
Shares exercised | 112,000 |  | 112,000 |  |
Intrinsic value of shares exercised | 194,000 |  | 194,000 |  |
Tax benefit realized for the deduction of exercises | $ 76,000 |  | $ 76,000 |  |
Stock appreciation rights (SARs) | 2004 |  |  |  |  |
Share-based compensation |  |  |  |  |
Range of exercise prices (in dollars per share) |  |  | $ 26.02 |  |
Number of options (in shares) | 62,000 |  | 62,000 |  |
Weighted-average remaining contractual life (in years) | 1.8 |  | 1.8 |  |
Weighted-average exercise price of shares outstanding and exercisable (in dollars per share) | $ 26.02 |  | $ 26.02 |  |
Stock appreciation rights (SARs) | 2005 |  |  |  |  |
Share-based compensation |  |  |  |  |
Range of exercise prices (in dollars per share) |  |  | $ 26.18 |  |
Number of options (in shares) | 108,000 |  | 108,000 |  |
Weighted-average remaining contractual life (in years) | 2.7 |  | 2.7 |  |
Weighted-average exercise price of shares outstanding and exercisable (in dollars per share) | $ 26.18 |  | $ 26.18 |  |

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- Definition The total accumulated difference between fair values of underlying shares on dates of exercise and exercise price on options which were exercised (or share units converted) during the reporting period. + References No definition available. + Details
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- Definition The decrease in the number of shares that could be issued attributable to the lapse of rights to exercise previously issued awards other than stock options under the terms of the award agreements under the plan during the reporting period. + References No definition available. + Details
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- Definition Represents the weighted average price at which option holders acquired shares when converting their stock options into shares under the plan during the reporting period. + References No definition available. + Details
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- Definition The weighted average price at which grantees could have exercised with respect to awards that were terminated during the reporting period due to noncompliance with plan terms during the reporting period. + References No definition available. + Details
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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph g(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=6793087&loc=d3e301413-122809 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph 64 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Aggregate proceeds received by the entity during the annual period from exercises of stock or unit options and conversion of similar instruments granted under equity-based payment arrangements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph i -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph g(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Disclosure of the aggregate tax benefit realized from the exercise of stock options and the conversion of similar instruments during the annual period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph i -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The total dollar difference between fair values of the underlying shares reserved for issuance and exercise prices of vested portions of options outstanding and currently exercisable under the option plan as of the balance sheet date. + 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 The total accumulated difference between fair values of underlying shares on dates of exercise and exercise price on options which were exercised (or share units converted) into shares during the reporting period under the plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph c(2) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options. + 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(1)(a) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(1)(b) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: 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 The weighted average price as of the beginning of the year at which grantees can acquire the shares reserved for issuance under the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(1)(a) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding. + 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)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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