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EMPLOYEE RETIREMENT PLANS (Details 2) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Change in projected benefit obligation    
Service cost $ 569 $ 563
Interest cost 2,204 2,207
Change in plan assets    
Fair value of plan assets, beginning of year 38,369  
Fair value of plan assets, end of year 37,353 38,369
Amounts recognized in the consolidated balance sheets consist of:    
Long-term pension liability (23,112) (27,766)
Amounts recognized in accumulated other comprehensive loss consist of:    
Net amount recognized 14,671 13,673
Defined Benefit Pension Plan [Member]    
Change in projected benefit obligation    
Projected benefit obligation, beginning of year 49,375 45,079
Service cost 360 378
Interest cost 1,608 1,616
Actuarial (gain) loss (4,039) 4,423
Benefits paid (2,294) (2,121)
Projected benefit obligation, end of year 45,010 49,375
Change in plan assets    
Fair value of plan assets, beginning of year 38,369 32,278
Actual return on plan assets (1,362) 4,590
Administrative expenses (360) (378)
Contributions 3,000 4,000
Benefits paid (2,294) (2,121)
Fair value of plan assets, end of year 37,353 38,369
Funded status of plan (7,657) (11,006)
Amounts recognized in the consolidated balance sheets consist of:    
Accrued liabilities - other 0 0
Long-term pension liability (7,657) (11,006)
Net amount recognized (7,657) (11,006)
Amounts recognized in accumulated other comprehensive loss consist of:    
Accumulated loss, net of income tax benefit of $4,082, $5,904, $1,102 and $2,166, respectively 11,616 9,916
Prior service cost, net of income tax liability of $0, $0, ($28) and ($75), respectively 0 0
Net amount recognized 11,616 9,916
Supplemental Pension Plan [Member]    
Change in projected benefit obligation    
Projected benefit obligation, beginning of year 17,176 15,409
Service cost 209 185
Interest cost 595 591
Actuarial (gain) loss (1,601) 1,519
Benefits paid (488) (528)
Projected benefit obligation, end of year 15,891 17,176
Change in plan assets    
Fair value of plan assets, beginning of year 0 0
Actual return on plan assets 0 0
Administrative expenses 0 0
Contributions 488 528
Benefits paid (488) (528)
Fair value of plan assets, end of year 0 0
Funded status of plan (15,891) (17,176)
Amounts recognized in the consolidated balance sheets consist of:    
Accrued liabilities - other (436) (416)
Long-term pension liability (15,455) (16,760)
Net amount recognized (15,891) (17,176)
Amounts recognized in accumulated other comprehensive loss consist of:    
Accumulated loss, net of income tax benefit of $4,082, $5,904, $1,102 and $2,166, respectively 3,136 3,854
Prior service cost, net of income tax liability of $0, $0, ($28) and ($75), respectively (81) (97)
Net amount recognized $ 3,055 $ 3,757