XML 89 R77.htm IDEA: XBRL DOCUMENT v3.8.0.1
EMPLOYEE RELATED LIABILITIES (Schedule of Amounts Recognized in Statement of Financial Position) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Postretirement Medical Plan [Member]      
Amounts recognized in statement of financial position:      
Current liabilities $ (58) $ (37) $ (40)
Non-current liabilities (1,878) (1,513) (1,741)
Net amount recognized $ (1,936) $ (1,550) $ (1,781)
Weighted average assumptions used:      
Discount rate 3.80% 4.50% 4.80%
Rate of compensation increases
Pension Plan [Member]      
Amounts recognized in statement of financial position:      
Non-current assets $ 2,606 $ 199
Non-current liabilities (79)
Net amount recognized $ 2,606 $ 199 $ (79)
Weighted average assumptions used:      
Discount rate 3.70% 4.30% 4.60%
Rate of compensation increases
Pre 65 [Member] | Postretirement Medical Plan [Member]      
Assumed health care cost trend rates:      
Health care cost trend rate assumed for next year 8.30% 7.20% 6.75%
Ultimate rate 4.50% 4.50% 4.50%
Year the ultimate rate is reached 2027 2025 2025
Post 65 [Member] | Postretirement Medical Plan [Member]      
Assumed health care cost trend rates:      
Health care cost trend rate assumed for next year 11.10% 10.00% 10.00%
Ultimate rate 4.50% 4.50% 5.00%
Year the ultimate rate is reached 2027 2025 2022