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Share-based compensation Stock Appreciation Rights (Details) - Stock appreciation rights (SARs) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Share-based Compensation, Stock Appreciation Rights [Roll Forward] |  |  |
Outstanding, beginning of period (in shares) | 164,000 | 164,000 | 282,000
Outstanding at the beginning of the period (in dollars per share) | $ 26.12 | $ 26.12 | $ 26.14
Granted (in shares) | 0 | 0 | 0
Granted (in dollars per share) | $ 0.00 | $ 0.00 | $ 0.00
Exercised (in shares) | (22,000) | 0 | (114,000)
Exercised (in dollars per share) | $ 26.18 | $ 0.00 | $ 26.17
Forfeited (in shares) | (62,000) | 0 | 0
Forfeited (in dollars per share) | $ 26.02 | $ 0.00 | $ 0.00
Expired (in shares) | 0 | 0 | (4,000)
Expired (in dollars per share) | $ 0.00 | $ 0.00 | $ 26.18
Outstanding, end of period (in shares) | 80,000 | 164,000 | 164,000
Outstanding at the end of the period (in dollars per share) | $ 26.18 | $ 26.12 | $ 26.12
Exercisable (in shares) | 80,000 | 164,000 | 164,000
Exercisable (in dollars per share) | $ 26.18 | $ 26.12 | $ 26.12
Intrinsic value of shares exercised | $ 29 | $ 0 | $ 197
Tax benefit realized for the deduction of exercises | $ 11 | $ 0 | $ 77
2005 |  |  |
Share-based Compensation, Stock Appreciation Rights [Roll Forward] |  |  |
Number of shares underlying SARs | 80,000 |  |
Weighted-average remaining contractual life | 3 months 18 days |  |
Weighted-average exercise price of shares outstanding and exercisable (in dollars per share) | $ 26.18 |  |

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- Definition The number of shares under the Stock Appreciation Rights plan that validly exist and are exercisable for which the share appreciation payment is calculated upon exercise. + References No definition available. + 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) 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 Disclosure of the aggregate tax benefit realized from the exercise of stocks and the conversion of similar instruments during the annual 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 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 plan. + References No definition available. + Details
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- Definition Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements other than options exercisable and outstanding. + 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 The number of shares under the Stock Appreciation Rights plan that validly exist and are outstanding and exercisable for which the share appreciation payment is calculated upon exercise. + References No definition available. + Details
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- Definition The weighted average period between the balance sheet date and expiration for all awards outstanding and exercisable under the plan, which may be expressed in a decimal value for number of years. + References No definition available. + Details
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- Definition The weighted average price as of the end of the period at which grantees can acquire the shares reserved for issuance under the award plan. + References No definition available. + Details
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- Definition Number of shares other than options (or share units) exercised during the current period. + References No definition available. + 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 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 Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + 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)(iii)(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 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 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 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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