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Income Taxes Income Taxes (Tables) | 9 Months Ended
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Dec. 31, 2017
Income Tax Disclosure [Abstract] |
Schedule of Consolidated Income Tax Expense and Effective Income Tax Rates Reconciliation [Table Text Block] | The following table outlines consolidated income tax expense and the effective tax rates on pretax earnings for the quarter and nine months ended December 31, 2017, including the effects recorded for the new law:
|  | Three Months Ended December 31, 2017 |  | Nine Months Ended December 31, 2017
(in thousands of dollars) |  | Amount |  | Effective Tax Rate |  | Amount |  | Effective Tax Rate
Income before income taxes |  | $ | 62,229 |  |  |  |  | $ | 107,291 |  |  |
Income tax expense: |  |  |  |  |  |  |  |
Determined under previous tax law |  | $ | 22,506 |  |  | 36.2 | % |  | $ | 35,941 |  |  | 33.5 | %
Effect of new law: |  |  |  |  |  |  |  |
Adjustment of deferred tax assets and liabilities: |  |  |  |  |  |  |  |
- Initially recorded in net income |  | (5,426 | ) |  | (8.7 | )% |  | (5,426 | ) |  | (5.1 | )%
- Initially recorded in other comprehensive income |  | 9,800 |  |  | 15.7 | % |  | 9,800 |  |  | 9.1 | %
Reduction of U.S. tax liability on undistributed foreign earnings to estimate of one time transition tax |  | (14,528 | ) |  | (23.4 | )% |  | (14,528 | ) |  | (13.5 | )%
All other effects |  | (342 | ) |  | (0.5 | )% |  | (342 | ) |  | (0.3 | )%
Total effect of new law |  | $ | (10,496 | ) |  | (16.9 | )% |  | $ | (10,496 | ) |  | (9.8 | )%
Total income tax expense under new law |  | $ | 12,010 |  |  | 19.3 | % |  | $ | 25,445 |  |  | 23.7 | %

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- Definition Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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