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Employee Benefit Plans (Narrative) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Employee Benefit Plans [Abstract]        
Employer contributions   $ 3,160 $ 3,156  
Contributions for plan   3,000 3,000  
Estimated future benefit payments for defined-benefit plans        
2014 3,700 3,700    
2015 3,800 3,800    
2016 4,000 4,000    
2017 4,100 4,100    
2018 4,300 4,300    
2019 - 2023 23,200 23,200    
Defined benefit pension plans   10,240 (2,077) (7,895)
Defined benefit plan, description of plan target allocations   The current investment objective is to produce income and long-term appreciation through a target asset allocation of 35% debt securities and other fixed income investments including cash and short-term instruments, and 65% equity investments, to provide for the current and future benefit payments of the plans.    
Contributions to employee benefits plan   3,000 2,300 2,000
Discretionary contributions to employee benefit plan   $ 4,900 $ 3,300 $ 2,100
Percent of pension plan assets that were allocated to money market funds 94.00%