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Newly Adopted Accounting Pronouncements (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Assets [Abstract]    
Total Current Assets $ 468,644 $ 423,115
Total Assets 992,544 993,977
Liabilities [Abstract]    
Other Current Liabilities 71,895 69,447
Total Current Liabilities 248,874 236,507
Total Liabilities 676,192 $ 695,503
Difference between Revenue Guidance in Effect before and after Topic 606 [Member]    
Assets [Abstract]    
Net Receivables 1,312  
Total Current Assets 1,312  
Total Assets 1,312  
Liabilities [Abstract]    
Other Current Liabilities 1,312  
Total Current Liabilities 1,312  
Total Liabilities 1,312  
Calculated under Revenue Guidance in Effect before Topic 606 [Member]    
Assets [Abstract]    
Net Receivables 214,858  
Total Current Assets 467,332  
Total Assets 991,232  
Liabilities [Abstract]    
Other Current Liabilities 70,583  
Total Current Liabilities 247,562  
Total Liabilities $ 674,880