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Shareholders' Equity (Tables)
 9 Months Ended
Sep. 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)
 
(166,464
)
 
—

 
(166,464
)
Reclassification adjustments included in earnings:
 
 
 
 
 

Loss on available for sale securities, net
 
802

 
—

 
802

Other comprehensive loss, before income taxes
 
(165,662
)
 
—

 
(165,662
)
Federal and state income taxes1
 
(42,183
)
 
—

 
(42,183
)
Other comprehensive loss, net of income taxes
 
(123,479
)
 
—

 
(123,479
)
Balance, September 30, 2018
 
$
(161,573
)
 
$
(789
)
 
$
(162,362
)
 
 
 
 
 
 

Balance, December 31, 2018
 
$
(70,999
)
 
$
(1,586
)
 
$
(72,585
)
Net change in unrealized gain (loss)
 
274,441

 
—

 
274,441

Reclassification adjustments included in earnings:
 
 
 
 
 

Gain on available for sale securities, net
 
(1,110
)
 
—

 
(1,110
)
Other comprehensive income, before income taxes
 
273,331

 
—

 
273,331

Federal and state income taxes1
 
66,993

 
—

 
66,993

Other comprehensive income, net of income taxes
 
206,338

 
—

 
206,338

Balance, September 30, 2019
 
$
135,339


$
(1,586
)
 
$
133,753


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