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Stock appreciation rights (''SARs'') (Details Textual) - $ / shares					9 Months Ended
	Mar. 06, 2015	Jun. 01, 2014	Mar. 12, 2014	Aug. 01, 2013	Sep. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise Price Per Share Appreciation Limit Under Condition One					exceed four times
Percentage Of Exercise Price Per Share Appreciation Limit Under Condition One					400.00%
Exercise Price Per Share Appreciation Limit Under Condition Two					exceed five times
Percentage Of Exercise Price Per Share Appreciation Limit Under Condition Two					500.00%
Stock Appreciation Rights (SARs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	37,797	5,595	22,118	1,078,125
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period					1,579
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Weighted Average Exercise Price					$ 13.87
Equity Incentive Plan 2013 [Member] | Officers And Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period					1,143,635

X

- Definition

Exercise price per share appreciation limit under condition one during the period.

+ References

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- Definition

Exercise price per share appreciation limit under condition two during the period.

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- Definition

Percentage of exercise price per share appreciation limit under condition one during the period.

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- Definition

Percentage of exercise price per share appreciation limit under condition two during the period.

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- Definition

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

+ References

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X

- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting 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 (c)(1)(iv)(3)



-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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X

- Definition

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).

+ 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)(iii)(1)



-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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