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SUPPLEMENTAL CASH FLOW INFORMATION (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Changes in operating assets and liabilities    
Accounts receivable, net $ 14,464 $ 1,772
Inventories (3,463) (5,870)
Other current assets 1,770 1,510
Income taxes 11,356 (584)
Accounts payable 5,680 (348)
Accrued expenses and other current liabilities (13,061) (9,690)
Accrued compensation related costs (20,650) (6,942)
Other liabilities (2,963) (3,240)
Changes in operating assets and liabilities on cash flows from operating activities (6,867) (23,392)
Non-cash financing and investing activities:    
Additions to property, plant and equipment acquired through financing obligations 1,509 1,299
Retirements of financed property, plant and equipment and related obligations 3,558 135
Purchase of property, plant and equipment in accounts payable at period end $ 2,419 $ 865