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Employee Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2012
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Schedule of Changes in Projected Benefit Obligations
The status of the plans at December 31, 2012 and 2011 are as follows:
 
2012
 
2011
Change in projected benefit obligation:
 
 
 
Projected benefit obligation at beginning of year
$
164,407

 
$
144,235

Service cost
608

 
539

Interest cost
6,832

 
7,393

Benefit payments
(6,558
)
 
(6,151
)
Actuarial loss
15,848

 
18,391

Projected benefit obligation at end of year
$
181,137

 
$
164,407

Change in plan assets:
 
 
 
Fair value of plan assets at beginning of year
$
174,938

 
$
157,996

Actual return on assets
18,463

 
22,867

Employer contributions
307

 
226

Benefit payments
(6,558
)
 
(6,151
)
Fair value of plan assets at end of year
$
187,150

 
$
174,938

Funded status – net prepaid
$
6,013

 
$
10,531

Amounts recognized in the consolidated balance sheets consist of:
 
 
 
Prepaid pension cost
$
12,891

 
$
15,956

Accrued liabilities
(309
)
 
(219
)
Pension benefit obligations
(6,569
)
 
(5,206
)
Net amount recognized
$
6,013

 
$
10,531

Pre-tax components of accumulated other comprehensive income (loss):
 
 
 
Unrecognized actuarial loss
$
(29,778
)
 
$
(23,131
)
Unrecognized prior service cost
(1,617
)
 
(1,942
)
Total
$
(31,395
)
 
$
(25,073
)
Accumulated benefit obligation
$
180,551

 
$
163,874
Schedule of Supplemental Contributions and 401(K) Match
The amounts expensed are summarized below: 
 
2012
 
2011
 
2010
Supplemental contributions and 401(k) match
$
5,260

 
$
4,414

 
$
1,634
Pension Plans, Defined Benefit
  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Components of the net periodic pension and postretirement benefit cost
Components of net periodic pension credit are as follows:
 
2012
 
2011
 
2010
Service cost
$
608

 
$
539

 
$
623

Interest cost
6,832

 
7,393

 
7,456

Expected return on assets
(9,855
)
 
(10,054
)
 
(9,342
)
Amortization of prior service cost
324

 
324

 
231

Amortization of actuarial loss
594

 
229

 
237

Net periodic pension credit
$
(1,497
)
 
$
(1,569
)
 
$
(795
)
Schedule of Assumptions Used
The assumptions used to measure the projected benefit obligations for the Company’s defined benefit pension plans are as follows:
 
2012
 
2011
Discount rate
3.50 - 3.75%
 
4.25
%
Projected annual salary increases
0 - 3.00%
 
0 - 3.00%

The assumptions used to determine net periodic pension credit are as follows: 
 
2012
 
2011
 
2010
Discount rate
4.25
%
 
5.25
%
 
5.75
%
Expected long-term rate of return on plan assets
5.75
%
 
6.50
%
 
6.50
%
Projected annual salary increases
0 - 3.00%

 
0 - 3.00%

 
0 - 3.00%
Schedule of Fair Value of Plan Assets
The fair values of the Company’s pension plan assets fall within the following levels of the fair value hierarchy as of December 31, 2012:
 
Level 1
 
Level 2
 
Level 3
 
Total
Fixed income securities (1)
$
10,562

 
$
176,610

 
$
—

 
$
187,172

Accounts payable – pending trades
 
 
 
 
 
 
(22
)
Total
 
 
 
 
 
 
$
187,150

 
(1)
Fixed income securities are comprised of corporate bonds (75%), government bonds (16%), government agencies securities (6%) and other fixed income securities (3%).
The fair values of the Company’s pension plan assets fall within the following levels of the fair value hierarchy as of December 31, 2011:
 
Level 1
 
Level 2
 
Level 3
 
Total
Fixed income securities (2)
$
9,949

 
$
172,694

 
$
—

 
$
182,643

Accounts payable – pending trades
 
 
 
 
 
 
(7,705
)
Total
 
 
 
 
 
 
$
174,938
Schedule of Expected Benefit Payments
The estimated future pension benefit payments are:
2013
$
7,974

2014
8,213

2015
8,828

2016
9,115

2017
9,607

2018 — 2022
51,839
Other Postretirement Benefit Plans, Defined Benefit
  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Components of the net periodic pension and postretirement benefit cost
Components of net periodic postretirement benefit cost for 2012, 2011 and 2010 were as follows:
 
2012
 
2011
 
2010
Service cost
$
161

 
$
164

 
$
177

Interest cost
170

 
222

 
219

Amortization of prior service cost
—

 
—

 
29

Amortization of actuarial gain
—

 
—

 
(16
)
Net periodic postretirement benefit cost
$
331

 
$
386

 
$
409
Schedule of Assumptions Used
The weighted average discount rate used to determine the net periodic postretirement benefit costs and the accumulated postretirement benefit obligations were as follows:
 
2012
 
2011
 
2010
Net periodic postretirement benefit costs
3.75
%
 
5.25
%
 
5.75
%
Accumulated postretirement benefit obligations
3.50
%
 
3.75
%
 
5.25
%
Schedule of Changes in Projected Benefit Obligations
The status of the postretirement benefit plans at December 31, 2012 and 2011 were as follows:
 
2012
 
2011
Change in accumulated postretirement benefit obligations:
 
 
 
Accumulated postretirement benefit obligation at beginning of year
$
4,635

 
$
4,339

Service cost
161

 
164

Interest cost
170

 
222

Benefit payments
(193
)
 
(100
)
Actuarial (gain) loss
(394
)
 
10

Accumulated postretirement benefit obligation at end of year
$
4,379

 
$
4,635

Funded status – net liability
$
4,379

 
$
4,635

Amounts recognized in the consolidated balance sheets consist of:
 
 
 
Accrued liabilities
$
(296
)
 
$
(218
)
Postretirement benefit obligations
(4,083
)
 
(4,417
)
Net amount recognized
$
(4,379
)
 
$
(4,635
)
Pre-tax components of accumulated other comprehensive income (loss):
 
 
 
Unrecognized actuarial gain
$
661

 
$
266

Total
$
661

 
$
266
Schedule of Assumed Health Care Cost and Trend Rates for Medical Plans
The assumed health care cost trend rates for medical plans at December 31 were as follows:
 
2012
 
2011
 
2010
Medical cost trend rate
8.00
%
 
8.50
%
 
8.00
%
Ultimate medical cost trend rate
5.00
%
 
5.00
%
 
5.00
%
Year ultimate medical cost trend rate will be reached
2019

 
2018

 
2013