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STOCKHOLDERS' EQUITY (AOCI comp) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Changes in accumulated other comprehensive loss, net of tax, by component          
Balances     $ 651,462    
Adjusted Balances         $ 651,878
OTHER COMPREHENSIVE INCOME (LOSS), net of tax $ (4,778) $ (175) 1,530 $ 1,216  
Balances 705,091   705,091    
Accumulated Other Comprehensive Loss          
Changes in accumulated other comprehensive loss, net of tax, by component          
Balances     (20,574) (23,417)  
Adjusted Balances         (24,150)
Other comprehensive income (loss) before reclassifications     (1,206) (2,712)  
Amounts reclassified from accumulated other comprehensive loss     2,736 3,928  
OTHER COMPREHENSIVE INCOME (LOSS), net of tax     1,530 1,216  
Balances (22,620) (22,201) (22,620) (22,201)  
Unrecognized Net Periodic Benefit Costs          
Changes in accumulated other comprehensive loss, net of tax, by component          
Balances     (19,715) (21,886)  
Adjusted Balances         (23,106)
Other comprehensive income (loss) before reclassifications     (1,987) (3,158)  
Amounts reclassified from accumulated other comprehensive loss     2,736 3,928  
OTHER COMPREHENSIVE INCOME (LOSS), net of tax     749 770  
Balances (22,357) (21,116) (22,357) (21,116)  
Interest Rate Swap          
Changes in accumulated other comprehensive loss, net of tax, by component          
Balances     292 (329)  
Adjusted Balances         355
Other comprehensive income (loss) before reclassifications     946 241  
OTHER COMPREHENSIVE INCOME (LOSS), net of tax     946 241  
Balances 1,301 (88) 1,301 (88)  
Foreign Currency Translation          
Changes in accumulated other comprehensive loss, net of tax, by component          
Balances     (1,151) (1,202)  
Adjusted Balances         (1,399)
Other comprehensive income (loss) before reclassifications     (165) 205  
OTHER COMPREHENSIVE INCOME (LOSS), net of tax     (165) 205  
Balances $ (1,564) $ (997) $ (1,564) $ (997)  
ASC Topic 220, Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income | Accumulated Other Comprehensive Loss          
Changes in accumulated other comprehensive loss, net of tax, by component          
Adjustment to beginning balance of accumulated other comprehensive loss for adoption of accounting standard(         (3,576)
ASC Topic 220, Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income | Unrecognized Net Periodic Benefit Costs          
Changes in accumulated other comprehensive loss, net of tax, by component          
Adjustment to beginning balance of accumulated other comprehensive loss for adoption of accounting standard(         (3,391)
ASC Topic 220, Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income | Interest Rate Swap          
Changes in accumulated other comprehensive loss, net of tax, by component          
Adjustment to beginning balance of accumulated other comprehensive loss for adoption of accounting standard(         63
ASC Topic 220, Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income | Foreign Currency Translation          
Changes in accumulated other comprehensive loss, net of tax, by component          
Adjustment to beginning balance of accumulated other comprehensive loss for adoption of accounting standard(         $ (248)