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Shareholders' equity (Tables)

6 Months Ended

Jun. 30, 2014

Shareholders' equity

Summary of Stock Option Activity under Plan

The following table summarizes stock option activity under the plan for the six months ended June 30, 2014 and 2013:

		For the Six Months Ended
		June 30, 2014						June 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			(30,000	)		15.00
​	​	​	​	​	​	​	​	​	​	​	​	​	​
Outstanding at end of the period			2,165,000		$	16.17			670,000		$	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

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 six months ended June 30, 2014:

Weighted average fair value		$	4.89
Weighted average remaining life (years)			9.7
Expected term (years)			7.0
Dividend Yield			3	%
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

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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

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