XML 34 R20.htm IDEA: XBRL DOCUMENT
v3.19.1

Income taxes | 3 Months Ended
--- | ---
Mar. 31, 2019
Income Tax Disclosure [Abstract] |
Income taxes | Income taxesThe Company’s and the Utilities’ effective tax rates were 20% and 22%, respectively, for the three months ended March 31, 2019. These rates differed from statutory rates, due primarily to the tax effect of the state income tax deduction and the amortization of excess deferred income taxes related to the provision in the Tax Act that lowered the federal income tax rate from 35% to 21%. The Company’s and the Utilities’ effective tax rate were 24% and 25%, respectively, for the three months ended March 31, 2018.

X
- References No definition available. + Details
Name: | us-gaap_IncomeTaxDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -URI http://asc.fasb.org/topic&trid=2144680 + Details
Name: | us-gaap_IncomeTaxDisclosureTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration