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Employee Benefit Plans (Narrative) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Defined Benefit Plan Disclosure [Line Items]      
Minimum contributions for plan $ 2,600    
Employer contributions 3,156 2,156  
Estimated contributions in 2013 3,000    
Estimated cost for defined benefit plans 400    
Estimated future benefit payments for defined-benefit plans      
2013 3,400    
2014 3,600    
2015 3,800    
2016 4,000    
2017 4,100    
2018 - 2021 22,700    
Pension liability, net of deferred taxes 2,077 7,895 (714)
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 2,300 2,000 1,800
Discretionary contributions to employee benefit plan $ 3,300 $ 2,100 $ 1,800