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STOCKHOLDERS' EQUITY (AOCI comp) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Changes in accumulated other comprehensive loss, net of tax, by component      
Balances $ 599,055 $ 588,728 $ 560,883
OTHER COMPREHENSIVE INCOME (LOSS), net of tax 2,843 4,079 (4,017)
Balances 651,462 599,055 588,728
Accumulated Other Comprehensive Loss      
Changes in accumulated other comprehensive loss, net of tax, by component      
Balances (23,417) (27,496) (23,479)
Other comprehensive income (loss) before reclassifications (1,968) (799)  
Amounts reclassified from accumulated other comprehensive loss 4,811 4,878  
OTHER COMPREHENSIVE INCOME (LOSS), net of tax 2,843 4,079 (4,017)
Balances (20,574) (23,417) (27,496)
Unrecognized Net Periodic Benefit Costs      
Changes in accumulated other comprehensive loss, net of tax, by component      
Balances (21,886) (25,497)  
Other comprehensive income (loss) before reclassifications (2,640) (1,267)  
Amounts reclassified from accumulated other comprehensive loss 4,811 4,878  
OTHER COMPREHENSIVE INCOME (LOSS), net of tax 2,171 3,611  
Balances (19,715) (21,886) (25,497)
Interest Rate Swap      
Changes in accumulated other comprehensive loss, net of tax, by component      
Balances (329) (545)  
Other comprehensive income (loss) before reclassifications 621 216  
OTHER COMPREHENSIVE INCOME (LOSS), net of tax 621 216  
Balances 292 (329) (545)
Foreign Currency Translation      
Changes in accumulated other comprehensive loss, net of tax, by component      
Balances (1,202) (1,454)  
Other comprehensive income (loss) before reclassifications 51 252  
OTHER COMPREHENSIVE INCOME (LOSS), net of tax 51 252  
Balances $ (1,151) $ (1,202) $ (1,454)