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Federal and State Income Taxes Federal and State Income Taes (Tables)
 9 Months Ended
Sep. 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
September 30,
 
Nine Months Ended
September 30,
 
2018
 
2017
 
2018
 
2017
Amount:
 
 
 
 
 
 
 
Federal statutory tax
$
31,963

 
$
44,880

 
$
91,767

 
$
137,048

Tax exempt revenue
(2,059
)
 
(3,001
)
 
(5,524
)
 
(9,336
)
Effect of state income taxes, net of federal benefit
3,740

 
2,486

 
10,685

 
7,875

Utilization of tax credits, net of proportional amortization of low-income housing limited partnership investments
56

 
(387
)
 
(2,611
)
 
(3,363
)
Share-based compensation
(26
)
 
(169
)
 
(2,070
)
 
(2,470
)
Adjustment to provisional amounts related to tax reform
—

 
—

 
1,895

 
—

Other, net
988

 
(1,371
)
 
4,798

 
(1,508
)
Total income tax expense
$
34,662

 
$
42,438

 
$
98,940

 
$
128,246


 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
 
2018
 
2017
 
2018
 
2017
Percent of pretax income:
 
 
 
 
 
 
 
Federal statutory tax
21.0
 %
 
35.0
 %
 
21.0
 %
 
35.0
 %
Tax exempt revenue
(1.4
)
 
(2.3
)
 
(1.3
)
 
(2.4
)
Effect of state income taxes, net of federal benefit
2.5

 
1.9

 
2.4

 
2.0

Utilization of tax credits, net of proportional amortization of low-income housing limited partnership investments
—

 
(0.3
)
 
(0.6
)
 
(0.9
)
Share-based compensation
—

 
(0.1
)
 
(0.5
)
 
(0.6
)
Adjustment to provisional amounts related to tax reform
—

 
—

 
0.4

 
—

Other, net
0.7

 
(1.1
)
 
1.2

 
(0.3
)
Total
22.8
 %
 
33.1
 %
 
22.6
 %
 
32.8
 %