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Newly Adopted Accounting Pronouncements (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
ASSETS    
Net Receivables $ 212,265 $ 209,516
Total Current Assets 434,680 423,115
Total Assets 1,015,902 993,977
LIABILITIES    
Other Current Liabilities 70,293 69,447
Total Current Liabilities 241,371 236,507
Total Liabilities 708,531 $ 695,503
Difference between Revenue Guidance in Effect before and after Topic 606 [Member]    
ASSETS    
Net Receivables 1,061  
Total Current Assets 1,061  
Total Assets 1,061  
LIABILITIES    
Other Current Liabilities 1,061  
Total Current Liabilities 1,061  
Total Liabilities 1,061  
Calculated under Revenue Guidance in Effect before Topic 606 [Member]    
ASSETS    
Net Receivables 211,204  
Total Current Assets 433,619  
Total Assets 1,014,841  
LIABILITIES    
Other Current Liabilities 69,232  
Total Current Liabilities 240,310  
Total Liabilities $ 707,470