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Shareholders' Equity (Tables)
 6 Months Ended
Jun. 30, 2019
Stockholders' Equity Note [Abstract]  
Accumulated Other Comprehensive Income (Loss) [Table Text Block]
A rollforward of the components of accumulated other comprehensive income (loss) is included as follows (in thousands):
 
 
Unrealized Gain (Loss) on
 
 
 
 
Available for Sale Securities
 
Employee Benefit Plans
 
Total
Balance, December 31, 2017
 
$
(35,385
)
 
$
(789
)
 
$
(36,174
)
Transition adjustment for net unrealized gains on equity securities
 
(2,709
)
 
—

 
(2,709
)
Net change in unrealized gain (loss)
 
(130,523
)
 
—

 
(130,523
)
Reclassification adjustments included in earnings:
 
 
 
 
 

Loss on available for sale securities, net
 
1,052

 
—

 
1,052

Other comprehensive income (loss), before income taxes
 
(129,471
)
 
—

 
(129,471
)
Federal and state income taxes1
 
(33,049
)
 
—

 
(33,049
)
Other comprehensive income (loss), net of income taxes
 
(96,422
)
 
—

 
(96,422
)
Balance, June 30, 2018
 
$
(134,516
)
 
$
(789
)
 
$
(135,305
)
 
 
 
 
 
 

Balance, December 31, 2018
 
$
(70,999
)
 
$
(1,586
)
 
$
(72,585
)
Net change in unrealized gain (loss)
 
228,156

 
—

 
228,156

Reclassification adjustments included in earnings:
 
 
 
 
 

Gain on available for sale securities, net
 
(1,105
)
 
—

 
(1,105
)
Other comprehensive income (loss), before income taxes
 
227,051

 
—

 
227,051

Federal and state income taxes1
 
55,897

 
—

 
55,897

Other comprehensive income (loss), net of income taxes
 
171,154

 
—

 
171,154

Balance, June 30, 2019
 
$
100,155


$
(1,586
)
 
$
98,569


1 
Calculated using a 25 percent blended federal and state statutory tax rate.