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Income taxes	6 Months Ended
	Jun. 30, 2018
Income taxes
Income taxes	11. Income taxes As a result of the Tax Cut and Jobs Act, signed into law on December 22, 2017,  the statutory tax rate for the Company was lowered to 21% from 35% effective January 1, 2018. This lowered the effective tax rate of the Company to 12.0% and 11.8% for the three and six months ended June 30, 2018 from 22.6% and 21.8% for the three and six months ended June 30, 2017.

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- Definition

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-URI http://asc.fasb.org/topic&trid=2144680

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