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Federal and State Income Taxes Federal and State Income Taes (Tables)
 6 Months Ended
Jun. 30, 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
June 30,
 
Six Months Ended
June 30,
 
2018
 
2017
 
2018
 
2017
Amount:
 
 
 
 
 
 
 
Federal statutory tax
$
31,182

 
$
47,800

 
$
59,804

 
$
92,168

Tax exempt revenue
(1,653
)
 
(3,224
)
 
(3,465
)
 
(6,335
)
Effect of state income taxes, net of federal benefit
3,288

 
2,944

 
6,945

 
5,389

Utilization of tax credits, net of proportional amortization of low-income housing limited partnership investments
(1,334
)
 
(889
)
 
(2,667
)
 
(2,976
)
Share-based compensation
(424
)
 
1,636

 
(2,044
)
 
(2,301
)
Adjustment to provisional amounts related to tax reform
—

 
—

 
1,895

 
—

Other, net
2,271

 
(562
)
 
3,810

 
(137
)
Total income tax expense
$
33,330

 
$
47,705

 
$
64,278

 
$
85,808


 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
 
2018
 
2017
 
2018
 
2017
Percent of pretax income:
 
 
 
 
 
 
 
Federal statutory tax
21.0
 %
 
35.0
 %
 
21.0
 %
 
35.0
 %
Tax exempt revenue
(1.1
)
 
(2.4
)
 
(1.2
)
 
(2.4
)
Effect of state income taxes, net of federal benefit
2.2

 
2.2

 
2.4

 
2.0

Utilization of tax credits, net of proportional amortization of low-income housing limited partnership investments
(0.9
)
 
(0.7
)
 
(0.9
)
 
(1.1
)
Share-based compensation
(0.3
)
 
1.2

 
(0.7
)
 
(0.9
)
Adjustment to provisional amounts related to tax reform
—

 
—

 
0.7

 
—

Other, net
1.5

 
(0.4
)
 
1.3

 
—

Total
22.4
 %
 
34.9
 %
 
22.6
 %
 
32.6
 %