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Share-based compensation (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 01, 2014 | Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014 | Mar. 31, 2015 | Dec. 31, 2014 | Mar. 31, 2014 | Dec. 31, 2013
Share-based compensation |  |  |  |  |  |  |  |  |
Capitalized share-based compensation expense |  | $ 50 | $ 30 | $ 90 | $ 70 |  |  |  |
Income tax benefit from compensation expense |  | $ 700 | $ 1,100 | $ 1,400 | 1,900 |  |  |  |
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 |  | 800,000 |  | 800,000 |  |  |  |  |
Nonemployee Director Stock Plan |  |  |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |  |  |  |
Shares available for future grant |  | 141,044 |  | 141,044 |  |  |  |  |
Income tax benefit from compensation expense |  |  |  | $ 300 | $ 300 |  |  |  |
Nonemployee director, shares granted |  |  |  | 28,246 | 33,170 |  |  |  |
Nonemployee director, fair value of grants |  |  |  | $ 800 | $ 800 |  |  |  |
Long-term Incentive 2012 to 2014 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 |  |  |  |  |  |  |  |  |
Unrecognized share based compensation |  | $ 5,600 |  | $ 5,600 |  |  |  |  |
Weighted average period for recognition of unrecognized compensation cost |  |  |  | 2 years 9 months 18 days |  |  |  |  |
Fair value measurement of vested units and related dividends |  |  |  | $ 3,000 | 4,000 |  |  |  |
Income tax benefit from compensation expense |  |  |  | $ 800 | $ 1,300 |  |  |  |
Nonvested equity instruments other than options outstanding |  | 252,302 | 264,326 | 252,302 | 264,326 | 261,691 | 261,235 | 332,158 | 288,151
Nonvested equity instruments other than options, weighted average grant date fair value |  | $ 28.35 | $ 25.74 | $ 28.35 | $ 25.74 | $ 28.33 | $ 25.77 | $ 25.04 | $ 25.17
Nonemployee director, shares granted |  | 788 | 0 | 85,082 | 115,036 |  |  |  |
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 |  |  |  |  |  |  |  |  |
Unrecognized share based compensation |  | $ 1,200 |  | $ 1,200 |  |  |  |  |
Weighted average period for recognition of unrecognized compensation cost |  |  |  | 1 year |  |  |  |  |
Measurement period for total return to shareholders |  |  |  | 3 years |  |  |  |  |
Stock volatility measurement period |  |  |  | 3 years |  |  |  |  |
Nonvested equity instruments other than options outstanding |  | 163,423 | 257,956 | 163,423 | 257,956 | 168,777 | 257,956 | 258,243 | 232,127
Nonvested equity instruments other than options, weighted average grant date fair value |  | $ 27.63 | $ 28.45 | $ 27.63 | $ 28.45 | $ 27.63 | $ 28.45 | $ 28.46 | $ 32.88
Nonemployee director, shares granted |  | 0 | 731 | 0 | 97,524 |  |  |  |
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 |  |  |  |  |  |  |  |  |
Unrecognized share based compensation |  | $ 1,800 |  | $ 1,800 |  |  |  |  |
Weighted average period for recognition of unrecognized compensation cost |  |  |  | 1 year |  |  |  |  |
Fair value measurement of vested units and related dividends |  |  |  | $ 4,700 | $ 1,900 |  |  |  |
Income tax benefit from compensation expense |  |  |  | $ 1,800 | $ 800 |  |  |  |
Nonvested equity instruments other than options outstanding |  | 220,158 | 359,782 | 220,158 | 359,782 | 230,219 | 364,731 | 360,070 | 296,843
Nonvested equity instruments other than options, weighted average grant date fair value |  | $ 26.00 | $ 26.01 | $ 26.00 | $ 26.01 | $ 26.00 | $ 26.01 | $ 26.01 | $ 26.14
Nonemployee director, shares granted |  | 0 | 730 | 0 | 129,603 |  |  |  |
Long-term Incentive 2013 to 2015 Plan Linked to Total Return to Shareholders |  |  |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |  |  |  |
Award requisite service period |  |  |  | 3 years |  |  |  |  |

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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 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 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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