DEFERRED CHARGES AND OTHER ASSETS - Future Amortization Exp (Details) $ in Thousands	Dec. 31, 2017 USD ($)
Amortization Expense For Deferred Charges Other Assets And Definite Lived Assets [Line Items]
2018	$ 14,960
2019	9,127
2020	7,570
2021	6,413
2022	6,026
Thereafter	7,676
Total amortization expense for deferred charges and other assets	51,772
Other Deferred Assets [Member]
Amortization Expense For Deferred Charges Other Assets And Definite Lived Assets [Line Items]
2018	2,104
2019	1,757
2020	1,172
2021	125
2022	114
Thereafter	0
Total amortization expense for deferred charges and other assets	5,272
Finite Lived Assets [Member]
Amortization Expense For Deferred Charges Other Assets And Definite Lived Assets [Line Items]
2018	12,856
2019	7,370
2020	6,398
2021	6,288
2022	5,912
Thereafter	7,676
Total amortization expense for deferred charges and other assets	$ 46,500