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Benefit Plans (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Medical and Dental Plan [Abstract]      
Contributions to plan by Entity $ 9,500 $ 8,741 $ 6,700
Stop loss insurance policy amount 235    
Unpaid claims under medical and dental plan 1,389 1,185  
Other standard medical benefits premiums paid 2,700    
Savings Plan [Abstract]      
Matching contribution (in hundredths) 50.00%    
Percentage of eligible compensation (in hundredths) 6.00%    
Recognized expense 3,300 3,000 2,400
Information related to pension plans [Abstract]      
Accumulated benefit obligation at end of period 52,825 59,744  
Change in projected benefit obligation [Roll Forward]      
Projected benefit obligation at beginning of period 59,744 53,467  
Interest cost 2,423 2,453 2,369
Net actuarial (gain) loss (7,695) 5,332  
Benefits paid (1,647) (1,508)  
Projected benefit obligation at end of period 52,825 59,744 53,467
Change in plan assets [Roll Forward]      
Fair value of plan assets at beginning of period 36,570 31,423  
Actual return on plan assets 6,465 4,268  
Company contributions 1,052 2,387  
Benefits paid (1,647) (1,508)  
Fair value of plan assets at end of period 42,440 36,570 31,423
Funded status: accrued pension liability included in other long-term liabilities (10,385) (23,174)  
Amounts recognized in accumulated other comprehensive income [Abstract]      
Net actuarial loss (4,393) (12,081)  
Amortization of actuarial loss 1,108    
Actuarial loss expected to be recognized as a component of net periodic pension expense 106    
Components of net periodic pension expense:      
Interest cost 2,423 2,453 2,369
Expected return on plan assets (2,520) (2,398) (2,342)
Amortization of net loss 1,108 909 273
Net periodic pension expense 1,011 964 300
Weighted-average assumptions used to determine benefit obligation [Abstract]      
Rate of compensation increase (in hundredths)    [1]    [1]  
Weighted-average assumptions used to determine net periodic pension expense [Abstract]      
Discount rate (in hundredths) 4.14% 4.65% 5.23%
Expected long-term rate of return on plan assets (in hundredths) 6.95% 7.57% 7.62%
Rate of compensation increase (in hundredths)    [1]    [1]    [1]
Defined benefit plan weighted average asset allocation [Abstract]      
Target (in hundredths) 100.00%    
Pension plan asset allocation 42,440 36,570 31,423
Actual allocation (in hundredths) 100.00% 100.00%  
Fair value of plan assets [Abstract]      
Fair value of plan assets 42,440 36,570 31,423
Estimated contributions in 2014 2,149    
Expected future benefit payments [Abstract]      
2014 1,776    
2015 1,838    
2016 1,971    
2017 2,176    
2018 2,279    
Years 2019 - 2023 13,353    
Quoted prices in active markets for identical asset (level 1) [Member]
     
Change in plan assets [Roll Forward]      
Fair value of plan assets at end of period 39,759 33,683  
Defined benefit plan weighted average asset allocation [Abstract]      
Pension plan asset allocation 39,759 33,683  
Fair value of plan assets [Abstract]      
Fair value of plan assets 39,759 33,683  
Significant Observable Inputs (Level 2) [Member]
     
Change in plan assets [Roll Forward]      
Fair value of plan assets at end of period 2,681 2,887  
Defined benefit plan weighted average asset allocation [Abstract]      
Pension plan asset allocation 2,681 2,887  
Fair value of plan assets [Abstract]      
Fair value of plan assets 2,681 2,887  
Significant unobservable inputs (level 3)
     
Change in plan assets [Roll Forward]      
Fair value of plan assets at end of period 0 0  
Defined benefit plan weighted average asset allocation [Abstract]      
Pension plan asset allocation 0 0  
Fair value of plan assets [Abstract]      
Fair value of plan assets 0 0  
Fixed Income Funds [Member]
     
Change in plan assets [Roll Forward]      
Fair value of plan assets at beginning of period 8,736    
Fair value of plan assets at end of period 7,307    
Defined benefit plan weighted average asset allocation [Abstract]      
Target (in hundredths) 24.00%    
Pension plan asset allocation 7,307    
Actual allocation (in hundredths) 17.00% 24.00%  
Fair value of plan assets [Abstract]      
Fair value of plan assets 7,307    
Domestic equity [Member]
     
Change in plan assets [Roll Forward]      
Fair value of plan assets at beginning of period 17,926    
Fair value of plan assets at end of period 23,903    
Defined benefit plan weighted average asset allocation [Abstract]      
Target (in hundredths) 49.00%    
Pension plan asset allocation 23,903    
Actual allocation (in hundredths) 56.00% 49.00%  
Fair value of plan assets [Abstract]      
Fair value of plan assets 23,903    
International equity [Member]
     
Change in plan assets [Roll Forward]      
Fair value of plan assets at beginning of period 6,257    
Fair value of plan assets at end of period 7,424    
Defined benefit plan weighted average asset allocation [Abstract]      
Target (in hundredths) 17.00%    
Pension plan asset allocation 7,424    
Actual allocation (in hundredths) 18.00% 17.00%  
Fair value of plan assets [Abstract]      
Fair value of plan assets 7,424    
Real Estate [Member]
     
Change in plan assets [Roll Forward]      
Fair value of plan assets at beginning of period 3,651    
Fair value of plan assets at end of period 3,806    
Defined benefit plan weighted average asset allocation [Abstract]      
Target (in hundredths) 10.00%    
Pension plan asset allocation 3,806    
Actual allocation (in hundredths) 9.00% 10.00%  
Fair value of plan assets [Abstract]      
Fair value of plan assets 3,806    
Mutual fund [Member]
     
Change in plan assets [Roll Forward]      
Fair value of plan assets at end of period 39,759 33,683  
Defined benefit plan weighted average asset allocation [Abstract]      
Pension plan asset allocation 39,759 33,683  
Fair value of plan assets [Abstract]      
Fair value of plan assets 39,759 33,683  
Mutual fund [Member] | Quoted prices in active markets for identical asset (level 1) [Member]
     
Change in plan assets [Roll Forward]      
Fair value of plan assets at end of period 39,759 33,683  
Defined benefit plan weighted average asset allocation [Abstract]      
Pension plan asset allocation 39,759 33,683  
Fair value of plan assets [Abstract]      
Fair value of plan assets 39,759 33,683  
Mutual fund [Member] | Significant Observable Inputs (Level 2) [Member]
     
Change in plan assets [Roll Forward]      
Fair value of plan assets at end of period 0 0  
Defined benefit plan weighted average asset allocation [Abstract]      
Pension plan asset allocation 0 0  
Fair value of plan assets [Abstract]      
Fair value of plan assets 0 0  
Mutual fund [Member] | Significant unobservable inputs (level 3)
     
Change in plan assets [Roll Forward]      
Fair value of plan assets at end of period 0 0  
Defined benefit plan weighted average asset allocation [Abstract]      
Pension plan asset allocation 0 0  
Fair value of plan assets [Abstract]      
Fair value of plan assets 0 0  
Collective trust [Member]
     
Change in plan assets [Roll Forward]      
Fair value of plan assets at end of period 2,681 2,887  
Defined benefit plan weighted average asset allocation [Abstract]      
Pension plan asset allocation 2,681 2,887  
Fair value of plan assets [Abstract]      
Fair value of plan assets 2,681 2,887  
Collective trust [Member] | Quoted prices in active markets for identical asset (level 1) [Member]
     
Change in plan assets [Roll Forward]      
Fair value of plan assets at end of period 0 0  
Defined benefit plan weighted average asset allocation [Abstract]      
Pension plan asset allocation 0 0  
Fair value of plan assets [Abstract]      
Fair value of plan assets 0 0  
Collective trust [Member] | Significant Observable Inputs (Level 2) [Member]
     
Change in plan assets [Roll Forward]      
Fair value of plan assets at end of period 2,681 2,887  
Defined benefit plan weighted average asset allocation [Abstract]      
Pension plan asset allocation 2,681 2,887  
Fair value of plan assets [Abstract]      
Fair value of plan assets 2,681 2,887  
Collective trust [Member] | Significant unobservable inputs (level 3)
     
Change in plan assets [Roll Forward]      
Fair value of plan assets at end of period 0 0  
Defined benefit plan weighted average asset allocation [Abstract]      
Pension plan asset allocation 0 0  
Fair value of plan assets [Abstract]      
Fair value of plan assets $ 0 $ 0  
Equity and real estate [Member] | Minimum [Member]
     
Defined benefit plan weighted average asset allocation [Abstract]      
Target (in hundredths) 65.00%    
Equity and real estate [Member] | Maximum [Member]
     
Defined benefit plan weighted average asset allocation [Abstract]      
Target (in hundredths) 85.00%    
Salaried pension plan [Member]
     
Weighted-average assumptions used to determine benefit obligation [Abstract]      
Discount rate (in hundredths) 4.98% 4.10%  
Hourly pension plan [Member]
     
Weighted-average assumptions used to determine benefit obligation [Abstract]      
Discount rate (in hundredths) 5.01% 4.14%  
[1] No compensation increase was assumed as the plans were frozen effective December 31, 2008.