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Shareholders' equity (Tables) | 12 Months Ended
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Dec. 31, 2013
Equity [Abstract] |
Summary of Stock Option Activity under Plan | The following table summarizes stock option activity under the Plan for the years ended December 31, 2013 and 2012:
|  | Year ended December 31, |
|  | 2013 |  |  | 2012 |
|  | Stock Options |  |  | Weighted Average Exercise Price |  |  | Stock Options |  |  | Weighted Average Exercise Price |
Outstanding at beginning of the year |  |  | 700,000 |  |  | $ | 15.00 |  |  |  | — |  |  | $ | — |
Granted |  |  | 550,000 |  |  |  | 16.03 |  |  |  | 700,000 |  |  |  | 15.00 |
Exercised |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Forfeited |  |  | (60,000 | ) |  |  | 15.00 |  |  |  | — |  |  |  | — |
Outstanding at end of the year |  |  | 1,190,000 |  |  | $ | 15.48 |  |  |  | 700,000 |  |  | $ | 15.00 |
Exercisable at end of the year |  |  | 160,000 |  |  | $ | 15.00 |  |  |  | — |  |  | $ | — |
Summary of Black-Scholes Option Pricing Model Inputs used for Valuation of Stock Options Outstanding | The following table summarizes the Black-Scholes Option Pricing Model inputs used for valuation of the stock options for Class A common shares issued during the year ended December 31, 2013:
Weighted average fair value |  | $ | 4.75 |
Weighted average remaining life (years) |  |  | 9.9 |
Expected term (years) |  |  | 7.0 |
Dividend Yield |  |  | 3 | %
Volatility |  |  | 38 | %
Risk-free interest rate |  |  | 1.98 | %

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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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