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Accumulated Other Comprehensive Income (Loss) (Tables)
 9 Months Ended
Sep. 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 nine month periods ended September 30, 2013 and 2012 (in thousands):
 
 
Defined Benefit Pension
 
Defined Benefit Post-Retirement
 
Gains and Losses on Derivative
 
Total
Balance as of June 30, 2012
 
$
(107,262
)
 
$
5,892

 
$
57

 
$
(101,313
)
Amounts reclassified from accumulated other comprehensive income:
 
 
 
 
 
 
 
 
Actuarial costs (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 September 30, 2012
 
$
(105,580
)
 
$
5,086

 
$
48

 
$
(100,446
)
 
 
 
 
 
 
 
 
 
Balance as of December 31, 2011
 
$
(110,626
)
 
$
7,504

 
$
75

 
$
(103,047
)
Amounts reclassified from accumulated other comprehensive income:
 
 
 
 
 
 
 
 
Actuarial costs (reclassified to salaries, wages and benefits)
 
8,011

 
324

 
—

 
8,335

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

 
(4,162
)
 
—

 
(4,162
)
Hedging gain (reclassified to interest expense)
 
—

 
—

 
(42
)
 
(42
)
Income tax (expense) or benefit
 
(2,964
)
 
1,419

 
15

 
(1,530
)
Other comprehensive income (loss), net of tax
 
5,047

 
(2,419
)
 
(27
)
 
2,601

Balance as of September 30, 2012
 
$
(105,579
)
 
$
5,085

 
$
48

 
$
(100,446
)
 
 
Defined Benefit Pension
 
Defined Benefit Post-Retirement
 
Gains and Losses on Derivative
 
Total
Balance as of June 30, 2013
 
$
(117,686
)
 
$
2,609

 
$
22

 
$
(115,055
)
Amounts reclassified from accumulated other comprehensive income:
 
 
 
 
 
 
 
 
Actuarial costs (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)
 
—

 
—

 
(12
)
 
(12
)
Income tax (expense) or benefit
 
(1,116
)
 
475

 
5

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

 
(834
)
 
(7
)
 
1,117

Balance as of September 30, 2013
 
$
(115,728
)
 
$
1,775

 
$
15

 
$
(113,938
)
 
 
 
 
 
 
 
 
 
Balance as of December 31, 2012
 
$
(121,602
)
 
$
4,277

 
$
38

 
$
(117,287
)
Amounts reclassified from accumulated other comprehensive income:
 
 
 
 
 
 
 
 
Actuarial costs (reclassified to salaries, wages and benefits)
 
9,222

 
312

 
—

 
9,534

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

 
(4,239
)
 
—

 
(4,239
)
Hedging gain (reclassified to interest expense)
 
—

 
—

 
(38
)
 
(38
)
Income tax (expense) or benefit
 
(3,348
)
 
1,425

 
15

 
(1,908
)
Other comprehensive income (loss), net of tax
 
5,874

 
(2,502
)
 
(23
)
 
3,349

Balance as of September 30, 2013
 
$
(115,728
)
 
$
1,775

 
$
15

 
$
(113,938
)