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Other Comprehensive Income (Loss)
 12 Months Ended
Dec. 31, 2012
Other Comprehensive Income (Loss) [Abstract]  
Other Comprehensive Income (Loss)
Other Comprehensive Income (Loss)

The components and allocated tax effects of other comprehensive income (loss) are as follows:
 
 
Before-Tax
 
Tax Expense
(Benefit)
 
After-Tax
 
 
(In thousands)
Year Ended December 31, 2012
 
 
 
 
 
 
Unrealized loss, net of reclassifications from sale or maturity, on available-for-sale securities
 
$
(236
)
 
$
(95
)
 
$
(141
)
Unrealized loss on hedging activities
 
(191,039
)
 
(74,846
)
 
(116,193
)
Pension plan curtailment
 
7,102

 
2,763

 
4,339

Change in minimum pension liability
 
(9,161
)
 
(3,564
)
 
(5,597
)
Retirement medical plan amendment
 
53,450

 
20,792

 
32,658

Other comprehensive loss
 
(139,884
)
 
(54,950
)
 
(84,934
)
Less other comprehensive income attributable to noncontrolling interest
 
1,364

 
—

 
1,364

Other comprehensive loss attributable to HollyFrontier stockholders
 
$
(141,248
)
 
$
(54,950
)
 
$
(86,298
)
 
 
 
 
 
 
 
Year Ended December 31, 2011
 
 
 
 
 
 
Unrealized loss on available-for-sale securities
 
$
(516
)
 
$
(199
)
 
$
(317
)
Unrealized gain on hedging activities
 
176,936

 
67,732

 
109,204

Change in minimum pension liability
 
(71
)
 
(28
)
 
(43
)
Change in retirement medical obligation
 
(3,515
)
 
(1,367
)
 
(2,148
)
Other comprehensive income
 
172,834

 
66,138

 
106,696

Less other comprehensive income attributable to noncontrolling interest
 
2,815

 
—

 
2,815

Other comprehensive income attributable to HollyFrontier stockholders
 
$
170,019

 
$
66,138

 
$
103,881

 
 
 
 
 
 
 
Year Ended December 31, 2010
 
 
 
 
 
 
Unrealized gain on available-for-sale securities
 
$
114

 
$
42

 
$
72

Unrealized loss on hedging activities
 
(923
)
 
275

 
(1,198
)
Change in minimum pension liability
 
(1,470
)
 
(572
)
 
(898
)
Change in retirement medical obligation
 
(238
)
 
(93
)
 
(145
)
Other comprehensive loss
 
(2,517
)
 
(348
)
 
(2,169
)
Less other comprehensive loss attributable to noncontrolling interest
 
(1,623
)
 
—

 
(1,623
)
Other comprehensive loss attributable to HollyFrontier stockholders
 
$
(894
)
 
$
(348
)
 
$
(546
)

The temporary unrealized gain (loss) on available-for-sale securities is due to changes in market prices of securities.

Accumulated other comprehensive income (loss) in the equity section of our consolidated balance sheets includes:
 
 
December 31,
 
 
2012
 
2011
 
 
(In thousands)
Pension obligation
 
$
(23,973
)
 
$
(22,715
)
Retirement medical obligation
 
28,605

 
(4,042
)
Unrealized gain (loss) on available-for-sale securities
 
(7
)
 
134

Unrealized gain (loss) on hedging instruments, net of noncontrolling interest
 
(13,050
)
 
104,496

Accumulated other comprehensive income (loss)
 
$
(8,425
)
 
$
77,873