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Employee Benefits (Details) (USD $)
12 Months Ended
Dec. 31, 2012
plan
Dec. 31, 2011
Dec. 31, 2010
Employee Benefits      
Number of defined benefit plans 2    
Reconciliation of benefit obligation:      
Service cost $ 8,843,000 $ 7,550,000 $ 6,367,000
Interest cost 8,918,000 8,997,000 8,712,000
Plan settlement (1,796,000)    
Expected future net benefit payments      
2013 7,344,000    
2014 7,708,000    
2015 8,416,000    
2016 10,354,000    
2017 10,993,000    
2018 - 2022 76,635,000    
Components of net periodic benefit cost:      
Service cost 8,843,000 7,550,000 6,367,000
Interest cost 8,918,000 8,997,000 8,712,000
Expected return on plan assets (6,431,000) (6,598,000) (6,218,000)
Amortization and other 6,748,000 4,027,000 4,046,000
Settlement 1,796,000    
Curtailment 1,134,000    
Net periodic benefit cost 21,008,000 13,976,000 12,907,000
Amounts not reflected in net periodic benefit cost and included in accumulated other comprehensive income (AOCI) before taxes      
Accumulated loss, net of gain (91,611,000) (81,708,000)  
Prior service cost, net of credit (72,000) (6,351,000)  
Total accumulated other comprehensive loss (91,683,000) (88,059,000)  
Amounts in AOCI expected to be recognized as components of net periodic benefit cost in 2013      
Accumulated loss, net of gain (6,588,000)    
Prior service cost, net of credit 24,000    
Estimated net periodic benefit cost (6,564,000)    
Contribution expense for multi-employer pension fund, the United Food & Commercial Workers International Union-Industry Pension Fund, which covers certain union employees under a collective bargaining agreement 584,000 545,000 528,000
Maximum percentage of total contributions to multi-employer pension fund 5.00% 5.00% 5.00%
Accumulated benefits exceed assets
     
Target allocation and pension plan asset allocation      
Estimated fair value of plan assets 97,586,000 91,512,000  
Reconciliation of benefit obligation:      
Benefit obligation at beginning of year 204,540,000 173,023,000  
Service cost 8,843,000 7,523,000  
Interest cost 8,918,000 9,025,000  
Actuarial losses 25,749,000 19,637,000  
Benefits paid (5,872,000) (4,668,000)  
Plan curtailments (6,136,000)    
Plan settlement (5,532,000)    
Plan amendments (3,785,000)    
Benefit obligation at end of year 226,725,000 204,540,000  
Reconciliation of fair value of plan assets:      
Fair value of plan assets at beginning of year 91,512,000 93,638,000  
Actual return on plan assets 9,426,000 807,000  
Employer contributions 8,052,000 1,735,000  
Benefits paid (5,872,000) (4,668,000)  
Plan settlement (5,532,000)    
Fair value of plan assets at end of year 97,586,000 91,512,000  
Funded status (129,139,000) (113,028,000)  
Components of net periodic benefit cost:      
Service cost 8,843,000 7,523,000  
Interest cost 8,918,000 9,025,000  
Settlement 5,532,000    
Defined benefit pension plan
     
Target allocation and pension plan asset allocation      
Requisite service period upon attaining age of 21 to be eligible for participation 1 year    
Requisite age of employees to be eligible for participation 21 years    
Estimated fair value of plan assets 97,586,000    
Weighted-average assumptions      
Long-term rate of increase in compensation levels (as a percent) 4.00%    
Reconciliation of fair value of plan assets:      
Fair value of plan assets at beginning of year 91,512,000    
Fair value of plan assets at end of year 97,586,000    
Funded status (45,515,000) (26,819,000)  
Accumulated benefit obligation 120,573,000 102,165,000  
Defined benefit pension plan | Level 1
     
Target allocation and pension plan asset allocation      
Estimated fair value of plan assets 76,400,000 66,321,000  
Reconciliation of fair value of plan assets:      
Fair value of plan assets at end of year 76,400,000 66,321,000  
Defined benefit pension plan | Level 2
     
Target allocation and pension plan asset allocation      
Estimated fair value of plan assets 21,186,000 25,191,000  
Reconciliation of fair value of plan assets:      
Fair value of plan assets at end of year 21,186,000 25,191,000  
Defined benefit pension plan | International/foreign equity securities
     
Target allocation and pension plan asset allocation      
Estimated fair value of plan assets 7,475,000 7,107,000  
Reconciliation of fair value of plan assets:      
Fair value of plan assets at end of year 7,475,000 7,107,000  
Defined benefit pension plan | International/foreign equity securities | Level 1
     
Target allocation and pension plan asset allocation      
Estimated fair value of plan assets 7,475,000 7,107,000  
Reconciliation of fair value of plan assets:      
Fair value of plan assets at end of year 7,475,000 7,107,000  
Defined benefit pension plan | Domestic equity securities
     
Target allocation and pension plan asset allocation      
Estimated fair value of plan assets 36,346,000 34,770,000  
Reconciliation of fair value of plan assets:      
Fair value of plan assets at end of year 36,346,000 34,770,000  
Defined benefit pension plan | Domestic equity securities | Level 1
     
Target allocation and pension plan asset allocation      
Estimated fair value of plan assets 36,346,000 34,770,000  
Reconciliation of fair value of plan assets:      
Fair value of plan assets at end of year 36,346,000 34,770,000  
Defined benefit pension plan | Fixed income mutual funds
     
Target allocation and pension plan asset allocation      
Estimated fair value of plan assets 12,533,000 6,400,000  
Reconciliation of fair value of plan assets:      
Fair value of plan assets at end of year 12,533,000 6,400,000  
Defined benefit pension plan | Fixed income mutual funds | Level 1
     
Target allocation and pension plan asset allocation      
Estimated fair value of plan assets 12,533,000 6,400,000  
Reconciliation of fair value of plan assets:      
Fair value of plan assets at end of year 12,533,000 6,400,000  
Defined benefit pension plan | Corporate bonds
     
Target allocation and pension plan asset allocation      
Estimated fair value of plan assets 6,387,000 18,526,000  
Reconciliation of fair value of plan assets:      
Fair value of plan assets at end of year 6,387,000 18,526,000  
Defined benefit pension plan | Corporate bonds | Level 2
     
Target allocation and pension plan asset allocation      
Estimated fair value of plan assets 6,387,000 18,526,000  
Reconciliation of fair value of plan assets:      
Fair value of plan assets at end of year 6,387,000 18,526,000  
Defined benefit pension plan | Money market funds
     
Target allocation and pension plan asset allocation      
Estimated fair value of plan assets 6,285,000 6,513,000  
Reconciliation of fair value of plan assets:      
Fair value of plan assets at end of year 6,285,000 6,513,000  
Defined benefit pension plan | Money market funds | Level 1
     
Target allocation and pension plan asset allocation      
Estimated fair value of plan assets 6,285,000 6,513,000  
Reconciliation of fair value of plan assets:      
Fair value of plan assets at end of year 6,285,000 6,513,000  
Defined benefit pension plan | U.S. Government agency securities
     
Target allocation and pension plan asset allocation      
Estimated fair value of plan assets 6,218,000    
Reconciliation of fair value of plan assets:      
Fair value of plan assets at end of year 6,218,000    
Defined benefit pension plan | U.S. Government agency securities | Level 2
     
Target allocation and pension plan asset allocation      
Estimated fair value of plan assets 6,218,000    
Reconciliation of fair value of plan assets:      
Fair value of plan assets at end of year 6,218,000    
Defined benefit pension plan | U.S. Government bonds
     
Target allocation and pension plan asset allocation      
Estimated fair value of plan assets 5,680,000    
Reconciliation of fair value of plan assets:      
Fair value of plan assets at end of year 5,680,000    
Defined benefit pension plan | U.S. Government bonds | Level 2
     
Target allocation and pension plan asset allocation      
Estimated fair value of plan assets 5,680,000    
Reconciliation of fair value of plan assets:      
Fair value of plan assets at end of year 5,680,000    
Defined benefit pension plan | Emerging markets - equity
     
Target allocation and pension plan asset allocation      
Estimated fair value of plan assets 5,607,000 3,349,000  
Reconciliation of fair value of plan assets:      
Fair value of plan assets at end of year 5,607,000 3,349,000  
Defined benefit pension plan | Emerging markets - equity | Level 1
     
Target allocation and pension plan asset allocation      
Estimated fair value of plan assets 5,607,000 3,349,000  
Reconciliation of fair value of plan assets:      
Fair value of plan assets at end of year 5,607,000 3,349,000  
Defined benefit pension plan | Real estate mutual fund
     
Target allocation and pension plan asset allocation      
Estimated fair value of plan assets 5,453,000 2,909,000  
Reconciliation of fair value of plan assets:      
Fair value of plan assets at end of year 5,453,000 2,909,000  
Defined benefit pension plan | Real estate mutual fund | Level 1
     
Target allocation and pension plan asset allocation      
Estimated fair value of plan assets 5,453,000 2,909,000  
Reconciliation of fair value of plan assets:      
Fair value of plan assets at end of year 5,453,000 2,909,000  
Defined benefit pension plan | Mutual funds-equities
     
Target allocation and pension plan asset allocation      
Estimated fair value of plan assets 2,701,000 3,485,000  
Reconciliation of fair value of plan assets:      
Fair value of plan assets at end of year 2,701,000 3,485,000  
Defined benefit pension plan | Mutual funds-equities | Level 1
     
Target allocation and pension plan asset allocation      
Estimated fair value of plan assets 2,701,000 3,485,000  
Reconciliation of fair value of plan assets:      
Fair value of plan assets at end of year 2,701,000 3,485,000  
Defined benefit pension plan | Treasury inflation indexed bonds
     
Target allocation and pension plan asset allocation      
Estimated fair value of plan assets 2,083,000    
Reconciliation of fair value of plan assets:      
Fair value of plan assets at end of year 2,083,000    
Defined benefit pension plan | Treasury inflation indexed bonds | Level 2
     
Target allocation and pension plan asset allocation      
Estimated fair value of plan assets 2,083,000    
Reconciliation of fair value of plan assets:      
Fair value of plan assets at end of year 2,083,000    
Defined benefit pension plan | Other
     
Target allocation and pension plan asset allocation      
Estimated fair value of plan assets 818,000 1,030,000  
Reconciliation of fair value of plan assets:      
Fair value of plan assets at end of year 818,000 1,030,000  
Defined benefit pension plan | Other | Level 2
     
Target allocation and pension plan asset allocation      
Estimated fair value of plan assets 818,000 1,030,000  
Reconciliation of fair value of plan assets:      
Fair value of plan assets at end of year 818,000 1,030,000  
Defined benefit pension plan | U.S. Treasury STRIPS
     
Target allocation and pension plan asset allocation      
Estimated fair value of plan assets   3,587,000  
Reconciliation of fair value of plan assets:      
Fair value of plan assets at end of year   3,587,000  
Defined benefit pension plan | U.S. Treasury STRIPS | Level 2
     
Target allocation and pension plan asset allocation      
Estimated fair value of plan assets   3,587,000  
Reconciliation of fair value of plan assets:      
Fair value of plan assets at end of year   3,587,000  
Defined benefit pension plan | Exchange traded funds-fixed income
     
Target allocation and pension plan asset allocation      
Estimated fair value of plan assets   1,788,000  
Reconciliation of fair value of plan assets:      
Fair value of plan assets at end of year   1,788,000  
Defined benefit pension plan | Exchange traded funds-fixed income | Level 1
     
Target allocation and pension plan asset allocation      
Estimated fair value of plan assets   1,788,000  
Reconciliation of fair value of plan assets:      
Fair value of plan assets at end of year   1,788,000  
Defined benefit pension plan | Municipal bonds
     
Target allocation and pension plan asset allocation      
Estimated fair value of plan assets   2,048,000  
Reconciliation of fair value of plan assets:      
Fair value of plan assets at end of year   2,048,000  
Defined benefit pension plan | Municipal bonds | Level 2
     
Target allocation and pension plan asset allocation      
Estimated fair value of plan assets   2,048,000  
Reconciliation of fair value of plan assets:      
Fair value of plan assets at end of year   2,048,000  
Defined benefit pension plan | Minimum
     
Weighted-average assumptions      
Discount rate used to determine obligations (as a percent) 2.50% 3.75% 4.45%
Discount rate used to determine net periodic benefit cost (as a percent) 3.75% 4.45% 5.25%
Expected return on plan assets (as a percent) 6.50% 7.00% 7.25%
Long-term rate of increase in compensation levels (as a percent)   4.00% 4.00%
Defined benefit pension plan | Minimum | Domestic large cap equity
     
Target allocation and pension plan asset allocation      
Target Allocations (as a percent) 29.00%    
Actual Composition of Plans (as a percent) 31.00% 29.00%  
Defined benefit pension plan | Minimum | Domestic small and mid-cap equity
     
Target allocation and pension plan asset allocation      
Target Allocations (as a percent) 7.00%    
Actual Composition of Plans (as a percent) 9.00% 11.00%  
Defined benefit pension plan | Minimum | International/foreign equity securities
     
Target allocation and pension plan asset allocation      
Target Allocations (as a percent) 11.00%    
Actual Composition of Plans (as a percent) 11.00% 10.00%  
Defined benefit pension plan | Minimum | Fixed income
     
Target allocation and pension plan asset allocation      
Target Allocations (as a percent) 25.00%    
Actual Composition of Plans (as a percent) 20.00% 23.00%  
Defined benefit pension plan | Minimum | Alternative investments
     
Target allocation and pension plan asset allocation      
Target Allocations (as a percent) 6.00%    
Actual Composition of Plans (as a percent) 8.00% 6.00%  
Defined benefit pension plan | Minimum | Cash and cash equivalents
     
Target allocation and pension plan asset allocation      
Target Allocations (as a percent) 1.00%    
Actual Composition of Plans (as a percent) 3.00% 2.00%  
Defined benefit pension plan | Maximum
     
Weighted-average assumptions      
Discount rate used to determine obligations (as a percent) 4.15% 4.70% 5.65%
Discount rate used to determine net periodic benefit cost (as a percent) 4.70% 5.65% 6.25%
Expected return on plan assets (as a percent) 7.25% 7.50% 7.75%
Long-term rate of increase in compensation levels (as a percent)   5.00% 5.00%
Defined benefit pension plan | Maximum | Domestic large cap equity
     
Target allocation and pension plan asset allocation      
Target Allocations (as a percent) 40.00%    
Actual Composition of Plans (as a percent) 42.00% 40.00%  
Defined benefit pension plan | Maximum | Domestic small and mid-cap equity
     
Target allocation and pension plan asset allocation      
Target Allocations (as a percent) 10.00%    
Actual Composition of Plans (as a percent) 12.00% 13.00%  
Defined benefit pension plan | Maximum | International/foreign equity securities
     
Target allocation and pension plan asset allocation      
Target Allocations (as a percent) 16.00%    
Actual Composition of Plans (as a percent) 13.00% 15.00%  
Defined benefit pension plan | Maximum | Fixed income
     
Target allocation and pension plan asset allocation      
Target Allocations (as a percent) 42.00%    
Actual Composition of Plans (as a percent) 37.00% 40.00%  
Defined benefit pension plan | Maximum | Alternative investments
     
Target allocation and pension plan asset allocation      
Target Allocations (as a percent) 8.00%    
Actual Composition of Plans (as a percent) 10.00% 7.00%  
Defined benefit pension plan | Maximum | Cash and cash equivalents
     
Target allocation and pension plan asset allocation      
Target Allocations (as a percent) 5.00%    
Actual Composition of Plans (as a percent) 4.00% 4.00%  
Supplemental executive plans and retirement agreements
     
Reconciliation of fair value of plan assets:      
Accumulated benefit obligation $ 68,194,000 $ 59,229,000