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STOCKHOLDERS' EQUITY (AOCI comp) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2017
Changes in accumulated other comprehensive loss, net of tax, by component                  
Balances $ 743,159 $ 721,755 $ 717,682 $ 668,515 $ 665,474 $ 651,462 $ 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 (LOSS), net of tax 4,799 (41) 1,850 (4,778) 2,236 4,072 6,608 1,530  
Balances 763,626 743,159 721,755 705,091 668,515 665,474 763,626 705,091  
Accumulated Other Comprehensive Loss                  
Changes in accumulated other comprehensive loss, net of tax, by component                  
Balances (12,429) (12,388) (14,238) (17,842) (20,078) (20,574) (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             (1,183) (1,206)  
Amounts reclassified from accumulated other comprehensive loss             7,791 2,736  
OTHER COMPREHENSIVE INCOME (LOSS), net of tax 4,799 (41) 1,850 (4,778) 2,236 4,072 6,608 1,530  
Balances (7,630) $ (12,429) (12,388) (22,620) $ (17,842) (20,078) (7,630) (22,620)  
Unrecognized Net Periodic Benefit Costs                  
Changes in accumulated other comprehensive loss, net of tax, by component                  
Balances     (12,749)     (19,715) (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             (291) (1,987)  
Amounts reclassified from accumulated other comprehensive loss             7,791 2,736  
OTHER COMPREHENSIVE INCOME (LOSS), net of tax             7,500 749  
Balances (5,249)     (22,357)     (5,249) (22,357)  
Interest Rate Swap, 2019                  
Changes in accumulated other comprehensive loss, net of tax, by component                  
Balances     591       591    
Other comprehensive income (loss) before reclassifications             (1,198)    
OTHER COMPREHENSIVE INCOME (LOSS), net of tax             (1,198)    
Balances (607)           (607)    
Interest Rate Swap, 2018                  
Changes in accumulated other comprehensive loss, net of tax, by component                  
Balances     591     292 591 292  
Adjustment to beginning balance of accumulated other comprehensive loss for adoption of accounting standard                 63
Adjusted Balances                 355
Other comprehensive income (loss) before reclassifications               946  
OTHER COMPREHENSIVE INCOME (LOSS), net of tax               946  
Balances       1,301       1,301  
Foreign Currency Translation                  
Changes in accumulated other comprehensive loss, net of tax, by component                  
Balances     $ (2,080)     $ (1,151) (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             306 (165)  
OTHER COMPREHENSIVE INCOME (LOSS), net of tax             306 (165)  
Balances $ (1,774)     $ (1,564)     $ (1,774) $ (1,564)