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Shareholders' equity (Tables) | 9 Months Ended
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Sep. 30, 2014
Shareholders' equity |
Summary of Stock Option Activity under Plan |
|  | For the Nine Months Ended, |
--- | --- | --- | ---
|  | September 30, 2014 |  | September 30, 2013 |
|  | Stock Options |  | Weighted-Average Exercise Price |  | Stock Options |  | Weighted-Average Exercise Price |
Outstanding at beginning of the period |  |  | 1,190,000 |  | $ | 15.48 |  |  | 700,000 |  | $ | 15.00 |
Granted |  |  | 1,220,000 |  |  | 16.74 |  |  | — |  |  | — |
Exercised |  |  | (28,750 | ) |  | 15.00 |  |  | — |  |  | — |
Forfeited |  |  | (216,250 | ) |  | 15.70 |  |  | (60,000 | ) |  | 15.00 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Outstanding at end of the period |  |  | 2,165,000 |  | $ | 16.17 |  |  | 640,000 |  | $ | 15.00 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Exercisable at end of the period |  |  | 131,250 |  | $ | 15.00 |  |  | — |  | $ | — |
Summary of Black-Scholes Option Pricing Model Inputs used for Valuation of Stock Options Outstanding |
Weighted-average fair value |  | $ | 4.89 |
Weighted-average remaining life (years) |  |  | 9.4 |
Expected term (years) |  |  | 7.0 |
Dividend yield |  |  | 3.0 | %
Volatility |  |  | 37.3 | %
Risk-free interest rate |  |  | 2.2 | %

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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + 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) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + 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 (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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