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Employee Benefit Plans (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Defined Benefit Plan, Benefit Obligation, Ending Balance $ 112,759,000 $ 93,101,000 $ 69,626,000
Pension Plans, Defined Benefit [Member]
      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Defined Benefit Plan, Benefit Obligation, Beginning Balance 93,101,000    
Defined Benefit Plan, Service Cost 7,531,000 5,985,000 4,762,000
Defined Benefit Plan, Interest Cost 4,072,000 3,916,000 3,420,000
Defined Benefit Plan, Contributions by Plan Participants 0 0  
Defined Benefit Plan, Actuarial Net (Gains) Losses 13,270,000 16,164,000  
Defined Benefit Plan, Benefits Paid (5,776,000) (2,100,000)  
Defined Benefit Plan, Foreign Currency Exchange Rate Changes, Benefit Obligation 561,000 (490,000)  
Defined Benefit Plan, Benefit Obligation, Ending Balance 112,759,000 93,101,000  
Other Postretirement Benefit Plans, Defined Benefit [Member]
      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Defined Benefit Plan, Benefit Obligation, Beginning Balance 28,854,000 18,395,000  
Defined Benefit Plan, Service Cost 1,641,000 1,116,000 847,000
Defined Benefit Plan, Interest Cost 1,246,000 1,035,000 882,000
Defined Benefit Plan, Contributions by Plan Participants 122,000 176,000  
Defined Benefit Plan, Actuarial Net (Gains) Losses 2,341,000 8,348,000  
Defined Benefit Plan, Benefits Paid (251,000) (216,000)  
Defined Benefit Plan, Foreign Currency Exchange Rate Changes, Benefit Obligation 0 0  
Defined Benefit Plan, Benefit Obligation, Ending Balance $ 33,953,000 $ 28,854,000 $ 18,395,000