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Share-based compensation (Details) (USD $) | 3 Months Ended | 9 Months Ended | 1 Months Ended |  |  | 9 Months Ended |  | 9 Months Ended |  |  |  |  | 9 Months Ended |  |  |  |  | 9 Months Ended |  |  |  |  | 0 Months Ended |
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Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Apr. 30, 2014 Stock appreciation rights (SARs) | Sep. 30, 2014 Stock appreciation rights (SARs) | Dec. 31, 2013 Stock appreciation rights (SARs) | Sep. 30, 2014 Restricted shares | Dec. 31, 2013 Restricted shares | Sep. 30, 2014 Restricted stock units | Sep. 30, 2013 Restricted stock units | Jun. 30, 2014 Restricted stock units | Dec. 31, 2013 Restricted stock units | Jun. 30, 2013 Restricted stock units | Dec. 31, 2012 Restricted stock units | Sep. 30, 2014 Long-term incentive plan (LTIP) | Sep. 30, 2014 LTIP linked to TRS | Sep. 30, 2013 LTIP linked to TRS | Jun. 30, 2014 LTIP linked to TRS | Dec. 31, 2013 LTIP linked to TRS | Jun. 30, 2013 LTIP linked to TRS | Dec. 31, 2012 LTIP linked to TRS | Sep. 30, 2014 2012-2014 LTIP linked to TRS | Sep. 30, 2014 2013-2015 LTIP linked to TRS | Sep. 30, 2014 2014 to 2016 LTIP linked to TRS | Sep. 30, 2014 LTIP awards linked to other performance conditions | Sep. 30, 2013 LTIP awards linked to other performance conditions | Jun. 30, 2014 LTIP awards linked to other performance conditions | Dec. 31, 2013 LTIP awards linked to other performance conditions | Jun. 30, 2013 LTIP awards linked to other performance conditions | Dec. 31, 2012 LTIP awards linked to other performance conditions | Mar. 01, 2014 Equity and Incentive Plan (EIP) | Sep. 30, 2014 Equity and Incentive Plan (EIP) | Sep. 30, 2014 Stock Option and Incentive Plan [Member] | Sep. 30, 2014 Nonemployee Director Stock Plan (2011 Director Plan)
Share-based compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional shares available for issuance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,500,000 |  |  |
Shares remaining available for future issuance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,600,000 |  |
Shares that can be issued upon vesting of outstanding units and achievement of performance goals |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,100,000 |  |
Estimated possible future issuances of shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,000 |
Number of shares available for grant |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 169,290
Outstanding awards (in shares) |  |  |  |  |  |  | 164,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average exercise price (in dollars per share) |  |  |  |  |  |  | $ 26.12 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate intrinsic value (in dollars) |  |  |  |  |  | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares underlying SARs |  |  |  |  | 62,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average exercise price (in dollars per share) |  |  |  |  | $ 26.02 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding awards (in shares) |  |  |  |  |  |  |  | 4,503 | 4,503 | 263,576 | 290,492 | 264,326 | 288,151 | 300,313 | 315,094 |  | 257,956 | 232,127 | 257,956 | 232,127 | 235,064 | 239,256 |  |  |  | 359,782 | 301,096 | 359,782 | 296,843 | 304,473 | 247,175 |  |  |  |
Outstanding, weighted-average exercise price |  |  |  |  |  |  |  | $ 22.21 | $ 22.21 | $ 25.76 | $ 25.16 | $ 25.74 | $ 25.17 | $ 25.15 | $ 22.82 |  | $ 28.45 | $ 32.88 | $ 28.45 | $ 32.88 | $ 32.87 | $ 29.12 |  |  |  | $ 26.01 | $ 26.12 | $ 26.01 | $ 26.14 | $ 26.12 | $ 25.04 |  |  |  |
Unrecognized compensation cost |  |  |  |  |  |  |  | 21,000 |  | 5,100,000 |  |  |  |  |  |  | 2,700,000 |  |  |  |  |  |  |  |  | 4,000,000 |  |  |  |  |  |  |  |  |
Weighted-average period over which unrecognized compensation cost expected to be recognized |  |  |  |  |  |  |  | 2 months 12 days |  | 2 years 7 months 6 days |  |  |  |  |  |  | 1 year 3 months 18 days |  |  |  |  |  |  |  |  | 1 year 3 months 18 days |  |  |  |  |  |  |  |  |
Fair value of vested stock (in dollars) |  |  |  |  |  |  |  |  |  | 4,100,000 | 3,600,000 |  |  |  |  |  |  | 2,200,000 |  |  |  |  |  |  |  | 1,900,000 | 600,000 |  |  |  |  |  |  |  |
Income tax benefit (in dollars) | $ 700,000 | $ 900,000 | $ 2,600,000 | $ 2,200,000 |  |  |  |  |  | $ 1,300,000 | $ 1,000,000 |  |  |  |  |  |  | $ 900,000 |  |  |  |  |  |  |  | $ 800,000 | $ 200,000 |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Award requisite service period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 years | 3 years | 3 years |  |  |  |  |  |  |  |  |  |

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- Definition The number of shares reserved for issuance under stock option agreements and other incentive plans, awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options. + References No definition available. + Details
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- Definition Represents the number of shares that could be issued upon vesting of share-based payment awards and achievement of performance goals. + References No definition available. + Details
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- Definition Represents the number of authorized but unissued shares that could be issued under the equity-based compensation plan. + References No definition available. + Details
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- Definition Unrecognized cost of unvested share-based compensation awards. + 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 (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (i) -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 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 Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (a)(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 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 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 Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + 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)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of additional shares authorized for issuance under an established share-based compensation plan. + References No definition available. + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + 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 Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable. + 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 For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired. + 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)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-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 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price 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 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 price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired. + References No definition available. + Details
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