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Income Taxes Income Taxes (Tables)
 9 Months Ended
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
 %