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RESTRUCTURINGS - Restructuring Reserve (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Restructuring Reserve [Roll Forward]            
Balance at beginning of period $ 2,681 $ 687   $ 202 $ 0 $ 0
Accrual:            
Continuing Operations 553 0   4,536 5,369  
Discontinued Operations 0 279   0 3,794  
Total 553 279 $ 4,500 4,536 9,163 9,100
Payments         (8,878)  
Balance at end of period 688 285 $ 688 688 285 $ 202
Severance and other employee related costs            
Accrual:            
Continuing Operations 553 0   4,536 5,369  
Discontinued Operations 0 279   0 2,899  
Total 553 279   4,536 8,268  
Payments $ (2,546) $ (681)   $ (4,050) (7,983)  
Other restructuring expense            
Accrual:            
Continuing Operations         0  
Discontinued Operations         895  
Total         895  
Payments         $ (895)