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SUPPLEMENTAL CASH FLOW INFORMATION (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Changes in operating assets and liabilities    
Accounts receivable, net $ 13,029 $ 5,061
Inventories 2,699 (4,113)
Other current assets (119) 947
Income taxes 11,690 345
Accounts payable 3,205 (1,267)
Accrued expenses and other current liabilities (14,300) (8,488)
Accrued compensation related costs (22,298) (6,234)
Other liabilities (2,538) (3,176)
Changes in operating assets and liabilities on cash flows from operating activities (8,632) (16,925)
Non-cash financing and investing activities:    
Additions to property, plant and equipment acquired through finance obligations 1,354 669
Retirements of financed property, plant and equipment and related obligations 2,246 135
Purchase of property, plant and equipment in accounts payable at period end $ 960 $ 1,100