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ACCOUNTING POLICIES - Assets Held for Sale and Discontinued Operations (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Jan. 01, 2018
Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle      
Cumulative effect adjustment to retained earnings $ 637   $ 30,643
Accounting Standards Update 2017-05      
New Accounting Pronouncements or Change in Accounting Principle      
Cumulative effect adjustment to retained earnings   $ 31,200