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Share-based compensation (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Mar. 01, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Dec. 31, 2014
Share-based compensation |  |  |  |  |  |
Capitalized share-based compensation expense |  | $ 30 | $ 40 | $ 120 | $ 120 |
Income tax benefit from compensation expense |  | $ 300 | $ 700 | $ 1,700 | $ 2,600 |
Equity and Incentive Plan |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |
Number of additional shares authorized | 1,500,000 |  |  |  |  |
Shares available for future issuance |  | 3,500,000 |  | 3,500,000 |  |
Number of share issuable upon vesting and achievement of performance goals |  | 700,000 |  | 700,000 |  |
Nonemployee Director Stock Plan |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |
Shares available for future grant |  | 141,044 |  | 141,044 |  |
Nonemployee director, shares granted |  |  |  | 28,246 | 33,170 |
Nonemployee director, fair value of grants |  |  |  | $ 800 | $ 800 |
Income tax benefit from compensation expense |  |  |  | $ 300 | $ 300 |
Long-term Incentive 2013 to 2015 Plan Linked to Total Return to Shareholders |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |
Award requisite service period |  |  |  | 3 years |  |
Stock appreciation rights (SARs) |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |
Options outstanding |  | 0 |  | 0 |  | 80,000
Options, weighted average exercise price (in dollars per share) |  |  |  |  |  | $ 26.18
Shares underlying SARs exercised |  | 0 | 0 | 80,000 | 0 |
Weighted-average price of shares exercised |  | $ 0.00 | $ 0.00 | $ 26.18 | $ 0.00 |
Aggregate intrinsic value of options outstanding |  | $ 0 | $ 0 | $ 502 | $ 0 |
Tax benefit realized for the deduction of exercises |  | $ 0 | $ 0 | $ 82 | $ 0 |
Restricted stock units |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |
Nonemployee director, shares granted |  | 690 | 2,750 | 85,772 | 117,786 |
Income tax benefit from compensation expense |  |  |  | $ 1,100 | $ 1,300 |
Unrecognized share based compensation |  | $ 4,700 |  | $ 4,700 |  |
Weighted average period for recognition of unrecognized compensation cost |  |  |  | 2 years 7 months 6 days |  |
Fair value measurement of vested units and related dividends |  |  |  | $ 3,700 | $ 4,100 |
Long-term Incentive Plan |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |
Payment award, low end of range |  |  |  | 0.00% |  |
Payment award, high end of range |  |  |  | 200.00% |  |
LTIP linked to TRS |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |
Nonemployee director, shares granted |  | 0 | 0 | 0 | 97,524 |
Unrecognized share based compensation |  | $ 900 |  | $ 900 |  |
Weighted average period for recognition of unrecognized compensation cost |  |  |  | 9 months 18 days |  |
Measurement period for total return to shareholders |  |  |  | 3 years |  |
Stock volatility measurement period |  |  |  | 3 years |  |
Long-term Incentive 2014 to 2016 Plan Linked to Total Return to Shareholders |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |
Award requisite service period |  |  |  | 3 years |  |
LTIP awards linked to other performance conditions |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |
Nonemployee director, shares granted |  | 0 | 0 | 0 | 129,603 |
Income tax benefit from compensation expense |  |  |  | $ 1,800 | $ 800 |
Unrecognized share based compensation |  | $ 1,400 |  | $ 1,400 |  |
Weighted average period for recognition of unrecognized compensation cost |  |  |  | 9 months 18 days |  |
Fair value measurement of vested units and related dividends |  |  |  | $ 4,700 | $ 1,900 |

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- Definition Represents the compensation cost capitalized during the period arising from equity-based compensation arrangements (for example, shares of stock, units, 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 2 -Subparagraph (h)(1)(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + 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 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 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 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 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 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 Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + 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 accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + 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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