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LEASES - Capital and Operating Leases - (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Cost basis and accumulated depreciation of assets recorded under capital leases    
Depreciation expense recorded under capital leases $ 7,299 $ 7,235
Capital Leases    
2019 1,057  
2020 376  
2021 252  
Total 1,685  
Less-portion representing interest at a weighted average annual rate of 5.0% (147)  
Principal 1,538  
Less-current portion (967) (762)
Capital lease obligations, noncurrent portion $ 571 941
Weighted average annual interest rate (as a percent) 5.00%  
Operating Leases    
2019 $ 3,524  
2020 2,784  
2021 2,334  
2022 2,333  
2023 2,213  
2024 and thereafter 6,340  
Total future minimum lease payments 19,528  
Total    
2019 4,581  
2020 3,160  
2021 2,586  
2022 2,333  
2023 2,213  
2024 and thereafter 6,340  
Future minimum lease payments 21,213  
Capital leases    
Cost basis and accumulated depreciation of assets recorded under capital leases    
Cost 4,354 2,460
Accumulated depreciation (951) (424)
Net book value 3,403 2,036
Depreciation expense recorded under capital leases $ 527 $ 295