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Shareholders' equity (Details 3) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Stock options
Class of Stock
Vesting period	4 years
Expiration period	10 years
Restricted stock units
Class of Stock
Vesting period	4 years
Expiration period	10 years
2012 Equity Incentive Plan | Stock options
Stock Options
Outstanding at beginning of the period (in shares)	1,190,000
Granted (in shares)	970,000	700,000
Forfeited (in shares)	(41,250)
Outstanding at end of the period (in shares)	2,118,750	700,000
Exercisable at end of the period (in shares)	160,000
Weighted Average Exercise Price
Outstanding at beginning of the period (in dollars per share)	$ 15.48
Granted (in dollars per share)	$ 16.63	$ 15.00
Forfeited (in dollars per share)	$ 16.18
Outstanding at end of the period (in dollars per share)	$ 15.99	$ 15.00
Exercisable at end of the period (in dollars per share)	$ 15.00
2012 Equity Incentive Plan | Restricted stock units
Class of Stock
Granted (in shares)	92,000

X

- Definition

Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, 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)

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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).

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-Publisher FASB

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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-Publisher FASB

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- Definition

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

+ References

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- Definition

The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

+ References

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-Publisher FASB

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Gross number of share options (or share units) granted during the period.

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Number of options outstanding, including both vested and non-vested options.

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-Publisher FASB

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

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- Definition

Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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