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COMMITMENTS AND CONTINGENCIES - Profit-Sharing Plan Expense, Including Matching Contributions (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]      
Profit-sharing plan expense $ 25,740 $ 46,507 $ 30,112