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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES – Revenue Recognition, Adjustments to Opening Balances (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Jan. 01, 2018
Dec. 31, 2017
Assets      
Inventories $ 343,170 $ 322,579 $ 337,216
Prepaid and other 104,998 123,775 109,791
Liabilities      
Accounts payable and accrued liabilities 509,118 455,873 461,579
Deferred income taxes 19,586 22,287 20,995
Deferred and other non-current liabilities 6,642 6,432 5,608
Stockholders' Equity      
Retained earnings 1,328,034 1,304,084 $ 1,301,147
Adjustment/Effect of Change | Accounting Standards Update 2014-09      
Assets      
Inventories (14,460) (14,637)  
Prepaid and other 14,136 13,984  
Liabilities      
Accounts payable and accrued liabilities (4,340) (5,706)  
Deferred income taxes 1,066 1,292  
Deferred and other non-current liabilities 519 824  
Stockholders' Equity      
Retained earnings $ 2,431 $ 2,937