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Accumulated Other Comprehensive Loss (Tables)
 12 Months Ended
Dec. 31, 2014
Stockholders' Equity Note [Abstract]  
Summary of Changes in Accumulated Other Comprehensive Loss for Pension Plan Items
Following is a summary of the changes in the accumulated balances for each component of accumulated other comprehensive loss, which is presented net of tax, for the year ended December 31, 2014 and 2013:
 
Defined Benefit Pension Items
 
Unrealized Gains and (Losses) on Available-for-Sale Securities
 
Total
Accumulated other comprehensive loss at December 31, 2013
$
(5,392
)
 
$
(2,125
)
 
$
(7,517
)
Other comprehensive income before reclassifications
(2,180
)
 
(509
)
 
(2,689
)
Amounts reclassified from accumulated other comprehensive loss
7,572

 
1,309

 
8,881

Net current year other comprehensive income (loss)
5,392

 
800

 
6,192

Accumulated other comprehensive loss at December 31, 2014
$
—

 
$
(1,325
)
 
$
(1,325
)

 
Defined Benefit Pension Items
 
Unrealized Gains and (Losses) on Available-for-Sale Securities
 
Total
Accumulated other comprehensive loss at December 31, 2012
$
(8,652
)
 
$
—

 
$
(8,652
)
Other comprehensive income before reclassifications
2,191

 
(2,032
)
 
159

Amounts reclassified from accumulated other comprehensive loss
1,069

 
(93
)
 
976

Net current year other comprehensive income (loss)
3,260

 
(2,125
)
 
1,135

Accumulated other comprehensive loss at December 31, 2013
$
(5,392
)
 
$
(2,125
)
 
$
(7,517
)
Reclassification out of Accumulated Other Comprehensive Income
 
 
Amount Reclassified from Accumulated Other Comprehensive Loss
 
 
Details about Accumulated Other Comprehensive Loss Components
 
2014
 
2013
 
Affected Line in the Consolidated Statements of Income
Defined Benefit Pension Items
 
 
 
 
 
 
Amortization of loss
 
$
465

 
$
326

 
Net periodic pension costs, Note 18, Employee Benefit Plans
Settlement cost
 
7,107

 
743

 
Net periodic pension costs, Note 18, Employee Benefit Plans
Total before tax
 
7,572

 
1,069

 
 
Income tax benefit
 
—

 
—

 
 
Net of tax
 
7,572

 
1,069

 
 
 
 
 
 
 
 
 
Items related to available-for-sale securities
 
 
 
 
 
 
Other-than-temporary impairment losses
 
1,295

 
—

 
Investment income, net, Note 6, Investments
Realized loss (gain) on sale
 
833

 
(93
)
 
Investment income, net, Note 6, Investments
Total before tax
 
2,128

 
(93
)
 
 
Income tax expense
 
(819
)
 
—

 
 
Net of tax
 
1,309

 
(93
)
 
 
 
 
 
 
 
 
 
Total reclassifications for the period
 
$
8,881

 
$
976

 
Net of tax