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Share-based compensation (Details 2) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Share-based compensation |  |  |
Share-based compensation expense (in dollars) | $ 3,800,000 | $ 2,700,000 | $ 1,100,000
Income tax benefit (in dollars) | 1,300,000 | 900,000 | 300,000
Nonqualified stock options (NQSOs) |  |  |
Shares |  |  |
Outstanding at the beginning of the period (in shares) | 215,500 | 374,500 | 375,500
Exercised (in shares) | (160,000) | (157,000) |
Expired (in shares) |  | (2,000) | (1,000)
Outstanding at the end of the period (in shares) | 55,500 | 215,500 | 374,500
Exercisable (in shares) | 55,500 | 215,500 | 374,500
Weighted-average exercise price |  |  |
Outstanding, at the beginning of the period (in dollars per share) | $ 20.76 | $ 19.73 | $ 19.73
Exercised (in dollars per share) | $ 20.70 | $ 18.32 |
Expired (in dollars per share) |  | $ 20.49 | $ 17.61
Outstanding, at the end of the period (in dollars per share) | $ 20.92 | $ 20.76 | $ 19.73
Exercisable (in dollars per share) | $ 20.92 | $ 20.76 | $ 19.73
Lower range of exercise prices (in dollars per share) | $ 20.49 |  |
Upper range of exercise prices (in dollars per share) | $ 21.68 |  |
Number of options (in shares) | 55,500 |  |
Weighted-average remaining contractual life (in years) | 0.7 |  |
Weighted-average exercise price of options outstanding and exercisable (in dollars per share) | $ 20.92 |  |
Aggregate intrinsic value (in dollars) | 500,000 |  |
Cash received from exercise (in dollars) | 3,312,000 | 2,876,000 |
Intrinsic value of shares exercised (in dollars) | 1,270,000 | 1,355,000 |
Tax benefit realized for the deduction of exercises (in dollars) | 181,000 | 278,000 |
Nonqualified stock options (NQSOs) | 2002 |  |  |
Weighted-average exercise price |  |  |
Range of exercise prices (in dollars per share) | $ 21.68 |  |
Number of options (in shares) | 20,000 |  |
Weighted-average remaining contractual life (in years) | 0.3 |  |
Weighted-average exercise price of options outstanding and exercisable (in dollars per share) | $ 21.68 |  |
Nonqualified stock options (NQSOs) | 2003 |  |  |
Weighted-average exercise price |  |  |
Range of exercise prices (in dollars per share) | $ 20.49 |  |
Number of options (in shares) | 35,500 |  |
Weighted-average remaining contractual life (in years) | 1.0 |  |
Weighted-average exercise price of options outstanding and exercisable (in dollars per share) | $ 20.49 |  |
Stock appreciation rights (SARs) |  |  |
Weighted-average exercise price |  |  |
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) | 282,000 |  |
Weighted-average remaining contractual life (in years) | 2.5 |  |
Weighted-average exercise price of shares outstanding and exercisable (in dollars per share) | $ 26.14 |  |
Aggregate intrinsic value (in dollars) | 200,000 |  |
Shares |  |  |
Outstanding, beginning of period (in shares) | 450,000 | 480,000 | 791,000
Exercised (in shares) | (110,000) |  |
Forfeited (in shares) |  |  | (6,000)
Expired (in shares) | (58,000) | (30,000) | (305,000)
Outstanding, end of period (in shares) | 282,000 | 450,000 | 480,000
Exercisable (in shares) | 282,000 | 450,000 | 480,000
Weighted-average exercise price |  |  |
Outstanding at the beginning of the period (in dollars per share) | $ 26.13 | $ 26.13 | $ 26.12
Exercised (in dollars per share) | $ 26.09 |  |
Forfeited (in dollars per share) |  |  | $ 26.18
Expired (in dollars per share) | $ 26.13 | $ 26.18 | $ 26.10
Outstanding at the end of the period (in dollars per share) | $ 26.14 | $ 26.13 | $ 26.13
Exercisable (in dollars per share) | $ 26.14 | $ 26.13 | $ 26.13
Shares vested |  |  | 228,000
Aggregate fair value of vested shares (in dollars) |  |  | 1,354,000
Intrinsic value of shares exercised | 64,000 |  |
Tax benefit realized for the deduction of exercises | 25,000 |  |
Dividend equivalent shares distributed under Section 409A |  |  | 3,143
Weighted-average Section 409A distribution price (in dollars per share) |  |  | $ 13.64
Intrinsic value of shares distributed under Section 409A |  |  | 43,000
Tax benefit realized for Section 409A distributions |  |  | $ 17,000
Number of months after end of calendar year within dividend equivalents subject to Section 409A will be paid | 2.5 |  |
Stock appreciation rights (SARs) | 2004 |  |  |
Weighted-average exercise price |  |  |
Range of exercise prices (in dollars per share) | $ 26.02 |  |
Number of options (in shares) | 72,000 |  |
Weighted-average remaining contractual life (in years) | 2.3 |  |
Weighted-average exercise price of shares outstanding and exercisable (in dollars per share) | $ 26.02 |  |
Stock appreciation rights (SARs) | 2005 |  |  |
Weighted-average exercise price |  |  |
Range of exercise prices (in dollars per share) | $ 26.18 |  |
Number of options (in shares) | 210,000 |  |
Weighted-average remaining contractual life (in years) | 2.6 |  |
Weighted-average exercise price of shares outstanding and exercisable (in dollars per share) | $ 26.18 |  |

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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 The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting 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 b(2)(e) -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)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + 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(2)(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 Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(2)(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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting 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 b(2)(d) -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)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The total fair value of equity-based awards for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. + 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 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 number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the 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)(c), d(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 (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable 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)(c) -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)(iii) -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 weighted average price at which option holders acquired shares when converting their stock options into shares under the plan during the reporting 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 b(1)(e) -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)(iv)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + 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 stock options under the terms of the option agreements under the plan during the reporting 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 b(1)(g) -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)(iv)(4) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that lapsed during the reporting 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 b(1)(g) -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)(iv)(4) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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