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Share-based compensation (Details 4) (USD $) | 6 Months Ended | 3 Months Ended | 6 Months Ended |  | 3 Months Ended | 6 Months Ended |  | 1 Months Ended |  | 6 Months Ended | 1 Months Ended |  | 6 Months Ended
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Jun. 30, 2011 Long-term incentive plan (LTIP) | Jun. 30, 2011 LTIP linked to TRS | Jun. 30, 2011 LTIP linked to TRS | Jun. 30, 2010 LTIP linked to TRS | Mar. 31, 2010 LTIP linked to TRS | Jun. 30, 2011 LTIP linked to other performance conditions | Jun. 30, 2011 LTIP linked to other performance conditions | Jun. 30, 2010 LTIP linked to other performance conditions | Mar. 31, 2010 LTIP linked to other performance conditions | May 31, 2011 2011-2013 LTIP linked to TRS | May 12, 2011 2011-2013 LTIP linked to TRS | Jun. 30, 2011 2011-2012 LTIP | May 31, 2011 2011-2013 LTIP linked to other performance conditions | May 12, 2011 2011-2013 LTIP linked to other performance conditions | Jun. 30, 2011 2009-2011 LTIP | Jun. 30, 2011 2010-2012 LTIP
Share-based compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payout low end of range (as a percent) | 0.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payout high end of range (as a percent) | 200.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Period for calculating total return to shareholders (in years) |  |  | 3 |  |  |  |  |  |  |  |  |  |  |  |  |
Average period used to calculate performance goals (in years) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 | 2
Period for calculating performance goals based on average consolidated net income (in years) |  |  |  |  |  |  |  |  |  |  |  | 3 |  |  |  |
Period for calculating performance goals based on average net income (in years) |  |  |  |  |  |  |  |  |  |  |  | 3 |  |  |  |
LTIP linked to TRS and other performance conditions (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding, beginning of period (in shares) |  | 200,735 | 126,782 | 36,198 | 132,588 | 273,550 | 161,310 | 24,131 | 184,535 |  | 475 |  |  | 712 |  |
Granted (in shares) |  | 475 | 75,015 | 97,191 |  | 712 | 113,831 | 160,939 |  |  |  |  |  |  |  |
Cancelled |  |  |  |  |  | (81,908) | (81,908) |  |  |  |  |  |  |  |  |
Forfeited (in shares) |  | (1,647) | (2,234) | (801) |  | (6,587) | (7,466) | (535) |  |  |  |  |  |  |  |
Outstanding, end of period (in shares) |  | 199,563 | 199,563 | 132,588 | 132,588 | 185,767 | 185,767 | 184,535 | 184,535 |  | 475 |  |  | 712 |  |
Total weighted-average grant-date fair value |  |  | $ 2,700,000 | $ 2,200,000 |  |  | $ 2,800,000 | $ 3,000,000 |  | $ 17,000 |  |  | $ 19,000 |  |  |
Weighted-average grant-date fair value per share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding, beginning of period (in dollars per share) |  | $ 25.94 | $ 20.33 | $ 14.85 | $ 20.42 | $ 21.26 | $ 18.66 | $ 16.99 | $ 18.69 |  | $ 26.25 |  |  | $ 26.25 |  |
Granted (in dollars per share) |  | $ 35.46 | $ 35.46 | $ 22.45 |  | $ 26.25 | $ 24.96 | $ 18.95 |  |  |  |  |  |  |  |
Forfeited (in dollars per share) |  | $ 22.45 | $ 22.45 | $ 14.85 |  | $ 18.95 | $ 18.95 | $ 16.99 |  |  |  |  |  |  |  |
Cancelled (in dollars per share) |  |  |  |  |  | $ 18.38 | $ 18.38 |  |  |  |  |  |  |  |  |
Outstanding, end of period (in dollars per share) |  | $ 25.99 | $ 25.99 | $ 20.42 | $ 20.42 | $ 22.63 | $ 22.63 | $ 18.69 | $ 18.69 |  | $ 26.25 |  |  | $ 26.25 |  |
Total weighted-average grant-date fair value |  |  | 2,700,000 | 2,200,000 |  |  | 2,800,000 | 3,000,000 |  | 17,000 |  |  | 19,000 |  |  |
Risk-free interest rate (as a percent) |  |  | 1.25% | 1.30% |  |  |  |  |  |  |  |  |  |  |  |
Expected life (in years) |  |  | 3 | 3 |  |  |  |  |  |  |  |  |  |  |  |
Expected volatility (as a percent) |  |  | 27.80% | 27.90% |  |  |  |  |  |  |  |  |  |  |  |
Range of expected volatility for Peer Group, minimum (as a percent) |  |  | 21.20% | 22.30% |  |  |  |  |  |  |  |  |  |  |  |
Range of expected volatility for Peer Group, maximum (as a percent) |  |  | 82.60% | 52.30% |  |  |  |  |  |  |  |  |  |  |  |
Grant date fair value (in dollars per share) |  | $ 35.46 | $ 35.46 | $ 22.45 | $ 22.45 |  |  |  |  |  | $ 35.46 |  |  |  |  |
Unrecognized compensation cost |  | $ 3,100,000 | $ 3,100,000 |  |  | $ 3,100,000 | $ 3,100,000 |  |  |  |  |  |  |  |  |
Weighted-average period over which unrecognized compensation cost expected to be recognized (in years) |  | 1.7 | 1.7 |  |  | 2.1 | 2.1 |  |  |  |  |  |  |  |  |

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- Definition As of the balance sheet date, the aggregate unrecognized cost of equity-based awards made to employees under equity-based compensation awards that have yet to vest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph h -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 (i) -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 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 grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target 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(2)(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)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target 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(2)(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 Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph c(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 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)(iii)(1) -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 weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units. + 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 period of time an equity-based award is expected to be outstanding. An equity-based award's expected term is generally determined based on, among other factors, the instrument's contractual term and the effects of employees' expected exercise and post-vesting employment termination behavior. + References Reference 1: 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.D.2) -URI http://asc.fasb.org/extlink&oid=6793087&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph e(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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section D -Subsection 2 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over 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 e(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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the maximum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph e(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 (f)(2)(iv) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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