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Employee Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2012
Employee Benefit Plans [Abstract]  
Components of accumulated other comprehensive income (loss), net periodic benefit cost
The components of accumulated other comprehensive loss, which have not yet been recognized as components of net periodic benefit cost, related to pensions and other postretirement benefits at December 31, 2012 are summarized below. The Company expects that $3.0 million in net actuarial loss and $0.2 million in prior service credit will be recognized as components of net periodic benefit cost in 2013.

  
Pension Benefits
  
Other Benefits
 
(In thousands)
 
2012
  
2011
  
2012
  
2011
 
Net actuarial loss
 $35,478  $37,914  $2,277  $2,323 
Prior service cost
  141   1,430   (672)  (874)
Total amounts recognized in accumulated other comprehensive loss (pre-tax)
 $35,619  $39,344  $1,605  $1,449 
Changes in benefit obligations, changes in plan assets, and the funded status of the pension plans and postretirement benefits
A December 31 measurement date is used for the pension, supplemental pension and postretirement benefit plans. The following table sets forth changes in benefit obligations, changes in plan assets, and the funded status of the pension plans and other postretirement benefits:

   
Pension Benefits
  
Other Benefits
 
(In thousands)
 
2012
  
2011
  
2012
  
2011
 
Change in benefit obligation
            
Benefit obligation at beginning of year
 $78,024  $70,229  $3,985  $4,554 
Service cost
  3,122   2,589   20   17 
Interest cost
  3,145   3,544   155   202 
Plan participants' contributions
  -   -   233   263 
Actuarial loss (gain)
  5,941   5,935   136   (562)
Amendments
  (1,006)  -   -   - 
Benefits paid
  (4,097)  (4,273)  (458)  (489)
Projected benefit obligation at end of year
  85,129   78,024   4,071   3,985 
Change in plan assets
                
Fair value of plan assets at beginning of year
  91,575   97,821   -   - 
Actual return (loss) on plan assets
  11,733   (2,452)  -   - 
Employer contributions
  493   479   225   226 
Plan participants' contributions
  -   -   233   263 
Benefits paid
  (4,097)  (4,273)  (458)  (489)
Fair value of plan assets at end of year
  99,704   91,575   -   - 
                  
Funded status at year end
 $14,575  $13,551  $(4,071) $(3,985)
Amounts recognized in balance sheet
The funded status of the pension and other postretirement benefit plans has been recognized as follows in the consolidated balance sheets at December 31, 2012 and 2011. An asset is recognized for an overfunded plan and a liability is recognized for an underfunded plan. The accumulated benefit obligation for pension benefits was $84.5 million and $76.5 million at December 31, 2012 and 2011, respectively. The accumulated benefit obligation for other postretirement benefits was $4.1 million and $4.0 million at December 31, 2012 and 2011, respectively.

  
Pension Benefits
  
Other Benefits
 
(In thousands)
 
2012
  
2011
  
2012
  
2011
 
Other assets
 $27,062  $23,972  $-  $- 
Other liabilities
  (12,487)  (10,421)  (4,071)  (3,985)
Funded status
 $14,575  $13,551  $(4,071) $(3,985)
Assumptions used to determine benefit obligations and net periodic pension cost
The following assumptions were used to determine the benefit obligation and the net periodic pension cost for the years indicated:

  
Years ended December 31,
 
(In thousands)
 
2012
  
2011
  
2010
 
Weighted average assumptions:
         
The following assumptions were used to determine benefit obligations:
         
Discount rate
  3.50%  4.10%  5.15%
Expected long-term return on plan assets
  7.50%  7.50%  8.00%
Rate of compensation increase
  3.00%  3.00%  3.00%
             
The following assumptions were used to determine net periodic pension cost:
            
Discount rate
  4.10%  5.15%  5.70%
Expected long-term return on plan assets
  7.50%  8.00%  8.00%
Rate of compensation increase
  3.00%  3.00%  3.00%
Components of net periodic pension benefits and other benefit costs
Net periodic benefit cost and other amounts recognized in other comprehensive income (loss) for the years ended December 31 included the following components:

   
Pension Benefits
  
Other Benefits
 
(In thousands)
 
2012
  
2011
  
2010
  
2012
  
2011
  
2010
 
Components of net periodic benefit cost
                  
Service cost
 $3,122  $2,589  $2,254  $20  $17  $17 
Interest cost
  3,145   3,544   3,613   155   202   228 
Expected return on plan assets
  (6,686)  (7,720)  (7,166)  -   -   - 
Amortization of prior service cost
  283   309   322   (202)  (202)  (202)
Amortization of unrecognized net loss
  3,330   1,353   1,447   182   205   201 
Net periodic pension cost
 $3,194  $75  $470  $155  $222  $244 
                          
Other changes in plan assets and benefit obligations recognized in other comprehensive income (pre-tax)
                        
Net loss (gain)
 $894  $16,108  $1,620  $136  $(562) $955 
Prior service cost
  (1,006)  -   21   -   -   - 
Amortization of prior service cost
  (283)  (309)  (322)  202   202   202 
Amortization of unrecognized net gain
  (3,330)  (1,353)  (1,447)  (182)  (205)  (201)
Total recognized in other comprehensive loss (income)
  (3,725)  14,446   (128)  156   (565)  956 
                          
Total recognized in net periodic benefit cost and other comprehensive income (loss) - pre-tax
 $(531) $14,521  $342  $311  $(343) $1,200 
Estimated future benefit payments for the pension plans and other postretirement benefit plans
The following table sets forth estimated future benefit payments for the pension plans and other postretirement benefit plans:
 
   
Pension
  
Other
 
   
Benefits
  
Benefits
 
        
2013
  5,247   215 
2014
  5,243   224 
2015
  5,285   234 
2016
  7,767   242 
2017
  5,942   250 
2018 - 2022
  29,180   1,311 
Effect of one-percentage point change in assumed health care cost trend rates
For measurement purposes, the annual rates of increase in the per capita cost of covered medical and prescription drug benefits for fiscal year 2012 were assumed to be 6.0 to 6.5 percent. The rates were assumed to decrease gradually to 5.0 percent for fiscal year 2018 and remain at that level thereafter. Assumed health care cost trend rates have a significant effect on amounts reported for health care plans. A one-percentage point change in the health care trend rates would have the following effects as of and for the year ended December 31, 2012:
 
(In thousands)
 
One
Percentage
point increase
  
One
Percentage
point decrease
 
Increase (decrease) on total service and interest cost components
 $24  $(20)
Increase (decrease) on postretirement accumulated benefit obligation
  503   (426)
Target and actual allocations of defined benefit pension plan's assets
The Company's key investment objectives in managing its defined benefit plan assets are to ensure that present and future benefit obligations to all participants and beneficiaries are met as they become due; to provide a total return that, over the long-term, maximizes the ratio of the plan assets to liabilities, while minimizing the present value of required Company contributions, at the appropriate levels of risk; to meet statutory requirements and regulatory agencies' requirements; and to satisfy applicable accounting standards. The Company periodically evaluates the asset allocations, funded status, rate of return assumption and contribution strategy for satisfaction of our investment objectives. The target and actual allocations expressed as a percentage of the defined benefit pension plan's assets are as follows:
 
   
Target 2013
  
2012
  
2011
 
Cash and cash equivalents
  0 - 20%  5%  2%
Fixed income securities
  20 - 40%  29%  34%
Equities
  40 - 80%  66%  64%
Total
      100%  100%
Financial instruments recorded at fair value on a recurring basis by the Plan
Only high-quality bonds are to be included in the portfolio. All issues that are rated lower than A by Standard and Poor's are to be excluded. Equity securities at December 31, 2012 and 2011 do not include any Company common stock. The following table presents the financial instruments recorded at fair value on a recurring basis by the Plan as of December 31, 2012 and 2011:
 
   
Quoted Prices in
  
Significant
  
Significant
    
   
Active Markets for
  
Other
  
Unobservable
  
Balance
 
   
Identical Assets
  
Observable Inputs
  
Inputs
  
as of
 
   
(Level 1)
  
(Level 2)
  
(Level 3)
  
December 31, 2012
 
Cash and Cash Equivalents
 $5,464  $-  $-  $5,464 
Foreign Equity Mutual Funds
  9,763   -   -   9,763 
Equity Mutual Funds
  13,110   -   -   13,110 
US Government Bonds
  -   12,744   -   12,744 
Corporate Bonds
  -   13,604   -   13,604 
Common Stock
  40,430   -   -   40,430 
Municipal bonds and Notes
  -   1,805   -   1,805 
Foreign Bonds and Notes
  -   1,137   -   1,137 
Foreign Equity
  1,647   -   -   1,647 
Totals
 $70,414  $29,290  $-  $99,704 
 
  
Quoted Prices in
  
Significant
  
Significant
    
  
Active Markets for
  
Other
  
Unobservable
  
Balance
 
  
Identical Assets
  
Observable Inputs
  
Inputs
  
as of
 
  
(Level 1)
  
(Level 2)
  
(Level 3)
  
December 31, 2011
 
Cash and Cash Equivalents
 $1,503  $-  $-  $1,503 
Foreign Equity Mutual Funds
  6,577   -   -   6,577 
Equity Mutual Funds
  9,902   -   -   9,902 
US Government Bonds
  -   15,683   -   15,683 
Corporate Bonds
  -   12,954   -   12,954 
Common Stock
  33,850   -   -   33,850 
Municipal bonds and Notes
  -   1,799   -   1,799 
Foreign Bonds and Notes
  -   1,096   -   1,096 
Foreign Equity
  8,211   -   -   8,211 
Totals
 $60,043  $31,532  $-  $91,575 
Fair value assumptions
The per share weighted average fair value of stock options granted during 2012, 2011, and 2010 was $4.57, $5.45, and $5.03, respectively. The fair value of each award is estimated on the grant date using the Black-Scholes option pricing model with the following weighted average assumptions used for grants in the years ended December 31. Historical information was the primary basis for the selection of the expected volatility, expected dividend yield and the expected lives of the options. The risk-free interest rate was selected based upon yields of the U.S. Treasury issues with a term equal to the expected life of the option being valued:
 
  
Years ended December 31,
 
 
2012
  
2011
  
2010
 
Dividend yield
  3.94%  3.31%–3.82%  3.27%–3.96%
Expected volatility
  34.64%  33.75%–34.36%  33.00%–33.86%
Risk-free interest rates
  1.24%  1.48%–2.81%  1.90%–3.17%
Expected life
  
7 years
   
7 years
   
7 years
 
Stock option activity
The following table summarizes information concerning stock options outstanding at December 31, 2012:

 
 
Number of Shares
  
Weighted
average
exercise
price
  
Weighted
Average
Remaining
Contractual
Term (in yrs)
  
Aggregate
Intrinsic
Value
 
Outstanding at December 31, 2011
  1,863,590  $22.41       
Granted
  150   20.30       
Exercised
  (108,817)  17.53       
Forfeited
  (11,150)  21.92       
Expired
  (48,211)  22.50       
Outstanding at December 31, 2012
  1,695,562  $22.72   4.58  $51,236 
                  
Exercisable at December 31, 2012
  1,480,737  $22.83   4.21  $43,043 
                  
Expected to Vest
  205,476  $21.97   7.01  $7,752 
Cash proceeds, tax benefits and intrinsic value of stock options exercised
Total stock-based compensation expense for stock option awards totaled $0.5 million for the year ended December 31, 2012, $0.9 million for the year ended December 31, 2011, and $1.8 million for the year ended December 31, 2010. Cash proceeds, tax benefits and intrinsic value related to total stock options exercised is as follows:
 
   
Years ended
 
(dollars in thousands)
 
2012
  
2011
  
2010
 
Proceeds from stock options exercised
 $1,908  $2,255  $1,778 
Tax benefits related to stock options exercised
  8   341   140 
Intrinsic value of stock options exercised
  498   897   574 
Fair value of shares vested during the year
  1,656   1,597   1,800 
Unvested restricted awards and unvested restricted units activity
The Company has outstanding restricted and deferred stock awards granted from various plans at December 31, 2012. The Company recognized $3.7 million in stock-based compensation expense related to these stock awards for the year ended December 31, 2012, $3.2 million for the year ended December 31, 2011, and $2.0 million for the year ended December 31, 2010. Tax benefits recognized with respect to restricted stock awards and stock units were $1.5 million, $1.2 million and $0.7 million for the years ended December 31, 2012, 2011 and 2010, respectively. Unrecognized compensation cost related to restricted stock awards and stock units totaled $4.7 million at December 31, 2012 and will be recognized over 2.5 years on a weighted average basis. Shares issued are funded from the Company's treasury stock. The following table summarizes information for unvested restricted stock awards outstanding as of December 31, 2012:

   
Number
  
Weighted-Average
 
   
of
  
Grant Date Fair
 
   
Shares
  
Value
 
Unvested Restricted Stock Awards
      
Unvested at January 1, 2012
  155,376  $23.92 
Forfeited
  (3,500) $21.96 
Vested
  (34,726) $22.61 
Unvested at December 31, 2012
  117,150  $24.36 
 
The following table summarizes information for unvested restricted stock units outstanding as of December 31, 2012:

   
Number
  
Weighted-Average
 
   
of
  
Grant Date Fair
 
   
Shares
  
Value
 
Unvested Restricted Stock Units
      
Unvested at January 1, 2012
  241,907  $23.95 
Forfeited
  (5,103)  - 
Vested
  (37,068)  - 
Granted
  206,322   22.38 
Unvested at December 31, 2012
  406,058  $25.64