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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES – Revenue Recognition, Adjustments to Opening Balances (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Jan. 01, 2018
Dec. 31, 2017
Assets      
Inventories $ 347,791 $ 322,579 $ 337,216
Prepaid and other 117,678 123,775 109,791
Liabilities      
Accounts payable and accrued liabilities 496,409 455,873 461,579
Deferred income taxes 20,578 22,287 20,995
Deferred and other non-current liabilities 6,682 6,432 5,608
Stockholders' Equity      
Retained earnings 1,332,218 1,304,084 $ 1,301,147
Adjustment/Effect of Change | Accounting Standards Update 2014-09      
Assets      
Inventories 922 (14,637)  
Prepaid and other (13,485) 13,984  
Liabilities      
Accounts payable and accrued liabilities 1,406 (5,706)  
Deferred income taxes (4) 1,292  
Deferred and other non-current liabilities 13 824  
Stockholders' Equity      
Retained earnings $ 6 $ 2,937