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STOCKHOLDERS' EQUITY (AOCI comp) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2017
Changes in accumulated other comprehensive loss, net of tax, by component      
Balances $ 717,682 $ 651,462  
Adjustment to beginning balance of accumulated other comprehensive loss for adoption of accounting standard     $ 416
Adjusted Balances     651,878
OTHER COMPREHENSIVE INCOME, net of tax 1,850 4,072  
Balances 721,755 665,474  
Accumulated Other Comprehensive Loss      
Changes in accumulated other comprehensive loss, net of tax, by component      
Balances (14,238) (20,574)  
Adjustment to beginning balance of accumulated other comprehensive loss for adoption of accounting standard     (3,576)
Adjusted Balances     (24,150)
Other comprehensive income (loss) before reclassifications 554 2,954  
Amounts reclassified from accumulated other comprehensive loss 1,296 1,118  
OTHER COMPREHENSIVE INCOME, net of tax 1,850 4,072  
Balances (12,388) (20,078)  
Unrecognized Net Periodic Benefit Costs      
Changes in accumulated other comprehensive loss, net of tax, by component      
Balances (12,749) (19,715)  
Adjustment to beginning balance of accumulated other comprehensive loss for adoption of accounting standard     (3,391)
Adjusted Balances     (23,106)
Other comprehensive income (loss) before reclassifications 661 2,590  
Amounts reclassified from accumulated other comprehensive loss 1,296 1,118  
OTHER COMPREHENSIVE INCOME, net of tax 1,957 3,708  
Balances (10,792) (19,398)  
Interest Rate Swap, 2019      
Changes in accumulated other comprehensive loss, net of tax, by component      
Balances 591    
Other comprehensive income (loss) before reclassifications (332)    
OTHER COMPREHENSIVE INCOME, net of tax (332)    
Balances 259    
Interest Rate Swap, 2018      
Changes in accumulated other comprehensive loss, net of tax, by component      
Balances 591 292  
Adjustment to beginning balance of accumulated other comprehensive loss for adoption of accounting standard     63
Adjusted Balances     355
Other comprehensive income (loss) before reclassifications   436  
OTHER COMPREHENSIVE INCOME, net of tax   436  
Balances   791  
Foreign Currency Translation      
Changes in accumulated other comprehensive loss, net of tax, by component      
Balances (2,080) (1,151)  
Adjustment to beginning balance of accumulated other comprehensive loss for adoption of accounting standard     (248)
Adjusted Balances     $ (1,399)
Other comprehensive income (loss) before reclassifications 225 (72)  
OTHER COMPREHENSIVE INCOME, net of tax 225 (72)  
Balances $ (1,855) $ (1,471)