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Federal and State Income Taxes Federal and State Income Taes (Tables)
 3 Months Ended
Mar. 31, 2018
Income Tax Disclosure [Abstract]  
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
The reconciliations of income attributable to continuing operations at the U.S. federal statutory tax rate to income tax expense are as follows (in thousands):
 
Three Months Ended
March 31,
 
2018
 
2017
Amount:
 
 
 
Federal statutory tax
$
28,622

 
$
44,368

Tax exempt revenue
(1,812
)
 
(3,111
)
Effect of state income taxes, net of federal benefit
3,657

 
2,445

Utilization of tax credits, net of proportional amortization of low-income housing limited partnership investments
(1,333
)
 
(2,087
)
Share-based compensation
(1,620
)
 
(3,937
)
Adjustment to provisional amounts related to tax reform
1,895

 
—

Other, net
1,539

 
425

Total income tax expense
$
30,948

 
$
38,103


 
Three Months Ended
March 31,
 
2018
 
2017
Percent of pretax income:
 
 
 
Federal statutory tax
21.0
 %
 
35.0
 %
Tax exempt revenue
(1.3
)
 
(2.5
)
Effect of state income taxes, net of federal benefit
2.7

 
1.9

Utilization of tax credits, net of proportional amortization of low-income housing limited partnership investments
(1.0
)
 
(1.6
)
Share-based compensation
(1.2
)
 
(3.1
)
Adjustment to provisional amounts related to tax reform
1.4

 
—

Other, net
1.1

 
0.4

Total
22.7
 %
 
30.1
 %