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Comprehensive Income (Tables)
 9 Months Ended
Sep. 29, 2012
Comprehensive Income [Abstract]  
Schedule of Comprehensive Income (Loss)
The components of other comprehensive income (loss) and the related tax impacts for the three months ended September 29, 2012 and October 1, 2011 are as follows (in thousands):

 
Before-Tax
 
Tax (Expense)
 
Net-of-Tax
 
Amount
 
or Benefit
 
Amount
 
September 29, 2012
October 1, 2011
 
September 29, 2012
October 1, 2011
 
September 29, 2012
October 1, 2011
Defined benefit pension plans
 
 
 
 
 
 
 
 
Amortization of prior service cost
$
23

$
23

 
$
(9
)
$
(9
)
 
$
14

$
14

Amortization of actuarial loss
1,189

681

 
(461
)
(264
)
 
728

417

Total defined benefit pension plans
1,212

704

 
(470
)
(273
)
 
742

431

Natural gas swap derivatives
 
 
 
 
 
 
 
 
Loss reclassified to net income
259

103

 
(101
)
(40
)
 
158

63

Loss activity recognized in other comprehensive loss
(123
)
(278
)
 
48

107

 
(75
)
(171
)
Total natural gas swap derivatives
136

(175
)
 
(53
)
67

 
83

(108
)
Interest rate swap derivatives
 
 
 
 
 
 
 
 
Loss reclassified to net income
—

285

 
—

(111
)
 
—

174

 
 
 
 
 
 
 
 
 
Other Comprehensive income (loss)
$
1,348

$
814

 
$
(523
)
$
(317
)
 
$
825

$
497


The components of other comprehensive income (loss) and the related tax impacts for the nine months ended September 29, 2012 and October 1, 2011 are as follows (in thousands):

 
Before-Tax
 
Tax (Expense)
 
Net-of-Tax
 
Amount
 
or Benefit
 
Amount
 
September 29, 2012
October 1, 2011
 
September 29, 2012
October 1, 2011
 
September 29, 2012
October 1, 2011
Defined benefit pension plans
 
 
 
 
 
 
 
 
Amortization of prior service cost
$
67

$
67

 
$
(25
)
$
(25
)
 
$
42

$
42

Amortization of actuarial loss
3,567

2,043

 
(1,383
)
(792
)
 
2,184

1,251

Total defined benefit pension plans
3,634

2,110

 
(1,408
)
(817
)
 
2,226

1,293

Natural gas swap derivatives
 
 
 
 
 
 
 
 
Loss reclassified to net income
1,267

148

 
(491
)
(57
)
 
776

91

Loss activity recognized in other comprehensive loss
(606
)
(509
)
 
234

196

 
(372
)
(313
)
Total natural gas swap derivatives
661

(361
)
 
(257
)
139

 
404

(222
)
Interest rate swap derivatives
 
 
 
 
 
 
 
 
Loss reclassified to net income
260

907

 
(101
)
(352
)
 
159

555

 
 
 
 
 
 
 
 
 
Other Comprehensive income (loss)
$
4,555

$
2,656

 
$
(1,766
)
$
(1,030
)
 
$
2,789

$
1,626