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STOCKHOLDERS' EQUITY (AOCI comp) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 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, net of tax $ 2,236 $ 781 6,308 $ 1,391  
Balances 668,515   668,515    
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     4,377 (1,442)  
Amounts reclassified from accumulated other comprehensive loss     1,931 2,833  
OTHER COMPREHENSIVE INCOME, net of tax     6,308 1,391  
Balances (17,842) (22,026) (17,842) (22,026)  
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     3,890 (1,569)  
Amounts reclassified from accumulated other comprehensive loss     1,931 2,833  
OTHER COMPREHENSIVE INCOME, net of tax     5,821 1,264  
Balances (17,285) (20,622) (17,285) (20,622)  
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     779 216  
OTHER COMPREHENSIVE INCOME, net of tax     779 216  
Balances 1,134 (113) 1,134 (113)  
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     (292) (89)  
OTHER COMPREHENSIVE INCOME, net of tax     (292) (89)  
Balances $ (1,691) $ (1,291) $ (1,691) $ (1,291)  
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)