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Accumulated Other Comprehensive Income (Loss) (Tables)
 6 Months Ended
Jun. 30, 2013
Stockholders' Equity Note [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss)
Accumulated other comprehensive income (loss) includes the following items by components for the three and six month periods ended June 30, 2013 and 2012 (in thousands):
 
 
Defined Benefit Pension
 
Defined Benefit Post-Retirement
 
Gains and Losses on Derivative
 
Total
Balance as of March 31, 2012
 
$
(108,944
)
 
$
6,698

 
$
66

 
$
(102,180
)
Amounts reclassified from accumulated other comprehensive income:
 
 
 
 
 
 
 
 
Actuarial gain (reclassified to salaries, wages and benefits)
 
2,670

 
108

 
—

 
2,778

Negative prior service cost (reclassified to salaries, wages and benefits)
 
—

 
(1,387
)
 
—

 
(1,387
)
Hedging gain (reclassified to interest expense)
 
—

 
—

 
(14
)
 
(14
)
Income tax (expense) or benefit
 
(988
)
 
473

 
5

 
(510
)
Other comprehensive income (loss), net of tax
 
1,682

 
(806
)
 
(9
)
 
867

Balance as of June 30, 2012
 
$
(107,262
)
 
$
5,892

 
$
57

 
$
(101,313
)
 
 
 
 
 
 
 
 
 
Balance as of December 31, 2011
 
$
(110,626
)
 
$
7,504

 
$
75

 
$
(103,047
)
Amounts reclassified from accumulated other comprehensive income:
 
 
 
 
 
 
 
 
Actuarial gain (reclassified to salaries, wages and benefits)
 
5,340

 
216

 
—

 
5,556

Negative prior service cost (reclassified to salaries, wages and benefits)
 
—

 
(2,774
)
 
—

 
(2,774
)
Hedging gain (reclassified to interest expense)
 
—

 
—

 
(28
)
 
(28
)
Income tax (expense) or benefit
 
(1,976
)
 
946

 
10

 
(1,020
)
Other comprehensive income (loss), net of tax
 
3,364

 
(1,612
)
 
(18
)
 
1,734

Balance as of June 30, 2012
 
$
(107,262
)
 
$
5,892

 
$
57

 
$
(101,313
)
 
 
Defined Benefit Pension
 
Defined Benefit Post-Retirement
 
Gains and Losses on Derivative
 
Total
Balance as of March 31, 2013
 
$
(119,644
)
 
$
3,443

 
$
30

 
$
(116,171
)
Amounts reclassified from accumulated other comprehensive income:
 
 
 
 
 
 
 
 
Actuarial gain (reclassified to salaries, wages and benefits)
 
3,074

 
104

 
—

 
3,178

Negative prior service cost (reclassified to salaries, wages and benefits)
 
—

 
(1,413
)
 
—

 
(1,413
)
Hedging gain (reclassified to interest expense)
 
—

 
—

 
(13
)
 
(13
)
Income tax (expense) or benefit
 
(1,116
)
 
475

 
5

 
(636
)
Other comprehensive income (loss), net of tax
 
1,958

 
(834
)
 
(8
)
 
1,116

Balance as of June 30, 2013
 
$
(117,686
)
 
$
2,609

 
$
22

 
$
(115,055
)
 
 
 
 
 
 
 
 
 
Balance as of December 31, 2012
 
$
(121,602
)
 
$
4,277

 
$
38

 
$
(117,287
)
Amounts reclassified from accumulated other comprehensive income:
 
 
 
 
 
 
 
 
Actuarial gain (reclassified to salaries, wages and benefits)
 
6,148

 
208

 
—

 
6,356

Negative prior service cost (reclassified to salaries, wages and benefits)
 
—

 
(2,826
)
 
—

 
(2,826
)
Hedging gain (reclassified to interest expense)
 
—

 
—

 
(26
)
 
(26
)
Income tax (expense) or benefit
 
(2,232
)
 
950

 
10

 
(1,272
)
Other comprehensive income (loss), net of tax
 
3,916

 
(1,668
)
 
(16
)
 
2,232

Balance as of June 30, 2013
 
$
(117,686
)
 
$
2,609

 
$
22

 
$
(115,055
)