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Employee Benefit Plans (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Components of net periodic pension expense:      
Interest cost $ 2,112 $ 2,206 $ 2,409
Expected return on plan assets (2,705) (2,648) (2,575)
Amortization of net loss 1,348 974 365
Defined Benefit Plan, Net Periodic Benefit Cost 755 532 199
Change in projected benefit obligation:      
Projected benefit obligation at beginning of year 57,268 49,925  
Interest cost 2,112 2,206 2,409
Benefits paid (1,813) (1,710)  
Actuarial (gains) losses (6,883) 6,847  
Projected benefit obligation at year end 50,684 57,268 49,925
Change in plan assets:      
Fair value of plan assets at beginning of year 37,941 34,020  
Actual return (loss) (6,202) 3,899  
Employer contributions 635 1,732  
Benefits paid (1,813) (1,710)  
Fair value of plan assets at year end 42,965 37,941 34,020
Funded status (Accrued pension liabilities) (7,719) (19,327)  
Unrecognized actuarial loss recognized in accumulated other comprehensive income 8,250 19,978  
Defined Benefit Plan, Amortization of Net Gains (Losses) 320    
Assumptions used to determine benefit obligation at year end:      
Discount rate 4.75% 3.75% 4.50%
Assumptions used to determine net periodic benefit cost:      
Discount rate 3.75% 4.50% 5.50%
Expected long-term weighted average rate of return on plan assets 7.25% 7.75% 7.75%
Defined Benefit Plan, Estimated Future Employer Contributions in Next Fiscal Year 1,729    
Expected future benefit payments      
2014 2,000    
2015 2,100    
2016 2,200    
2017 2,400    
2018 2,600    
In aggregate during five years thereafter 15,000    
Other Plan Information [Abstract]      
Multiemployer Plan, Period Contributions 908 760 518
Defined Contribution Savings Plan [Member]
      
Other Plan Information [Abstract]      
Defined contribution expense 9,814 8,011 6,241
VDIP [Member]
      
Other Plan Information [Abstract]      
Defined contribution expense $ 276 $ 507