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Commitments and Contingencies (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
USD ($)
item
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Commitments and Contingencies      
Lease expense $ 14,400 $ 15,500 $ 14,900
Operating lease commitments      
Total 32,804    
Less than One Year 7,217    
One to Three Years 13,127    
Three to Five Years 12,460    
More than Five Years 0    
Purchase commitments      
Total 227,247    
Less than One Year 185,615    
One to Three Years 41,517    
Three to Five Years 115    
More than Five Years $ 0    
Number of claims, lawsuits, investigations and proceedings, including unasserted claims that are probable to be assessed, are likely to have, a material change on the Company's financial position results of operations or cash flow | item 0