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ORGANIZATION AND DESCRIPTION OF THE BUSINESS AND FINANCIAL STATEMENT PRESENTATION (Other Accounting Pronouncements) (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Jan. 01, 2018
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Adopted Accounting Pronouncements          
Decrease in operating expenses   $ 770,103 $ 717,538 $ 2,247,573 $ 2,073,127
Increase in other cost   714 1,314 4,038 3,548
Net income   $ 40,776 14,788 51,963 23,158
ASC Topic 715, Compensation – Retirement Benefits | Adjustment          
Adopted Accounting Pronouncements          
Decrease in operating expenses     (2,400)   (5,800)
Increase in other cost     2,400   5,800
Net income     $ 0   $ 0
EPS (in dollars per share)     $ 0   $ 0
Accumulated Other Comprehensive Loss | ASC Topic 220, Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income          
Adopted Accounting Pronouncements          
Reclassification from AOCI to Retained earnings tax effect $ (3,600)        
Retained Earnings          
Adopted Accounting Pronouncements          
Net income       $ 51,963  
Retained Earnings | ASC Topic 220, Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income          
Adopted Accounting Pronouncements          
Reclassification from AOCI to Retained earnings tax effect $ 3,600