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STOCKHOLDERS' EQUITY (Details 2) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Changes in accumulated other comprehensive loss, net of tax, by component        
Balances     $ 560,883  
OTHER COMPREHENSIVE INCOME (LOSS), net of tax $ 3,708 $ 883 2,529 $ (1,871)
Balances 579,204   579,204  
Accumulated Other Comprehensive Loss        
Changes in accumulated other comprehensive loss, net of tax, by component        
Balances     (23,479) (14,912)
Other comprehensive income (loss) before reclassifications     230 (5,413)
Amounts reclassified from accumulated other comprehensive loss     2,299 3,542
OTHER COMPREHENSIVE INCOME (LOSS), net of tax     2,529 (1,871)
Balances (20,950) (16,783) (20,950) (16,783)
Unrecognized Net Periodic Benefit Costs        
Changes in accumulated other comprehensive loss, net of tax, by component        
Balances     (22,387) (14,386)
Other comprehensive income (loss) before reclassifications     548 (5,477)
Amounts reclassified from accumulated other comprehensive loss     2,299 3,542
OTHER COMPREHENSIVE INCOME (LOSS), net of tax     2,847 (1,935)
Balances (19,540) (16,321) (19,540) (16,321)
Interest Rate Swap        
Changes in accumulated other comprehensive loss, net of tax, by component        
Balances     (350)  
Other comprehensive income (loss) before reclassifications     (120)  
OTHER COMPREHENSIVE INCOME (LOSS), net of tax     (120)  
Balances (470)   (470)  
Foreign Currency Translation        
Changes in accumulated other comprehensive loss, net of tax, by component        
Balances     (742) (526)
Other comprehensive income (loss) before reclassifications     (198) 64
OTHER COMPREHENSIVE INCOME (LOSS), net of tax     (198) 64
Balances $ (940) $ (462) $ (940) $ (462)