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LEASES - Capital and Operating Leases - (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Cost basis and accumulated depreciation of assets recorded under capital leases    
Depreciation expense recorded under capital leases $ 6,471 $ 8,736
Capital Leases    
2017 523  
2018 523  
2019 523  
2020 43  
Total 1,612  
Less-portion representing interest at a weighted average annual rate of 5.0% (109)  
Principal 1,503  
Less-current portion (465) (447)
Capital lease obligations, noncurrent portion $ 1,038  
Weighted average annual interest rate (as a percent) 5.00%  
Operating Leases    
2017 $ 2,954  
2018 2,845  
2019 2,877  
2020 2,202  
2021 2,236  
2022 and thereafter 10,730  
Total future minimum lease payments 23,844  
Total    
2017 3,477  
2018 3,368  
2019 3,400  
2020 2,245  
2021 2,236  
2022 and thereafter 10,730  
Future minimum lease payments 25,456  
Capital leases    
Cost basis and accumulated depreciation of assets recorded under capital leases    
Cost 1,616 1,784
Accumulated depreciation (129) (503)
Net book value 1,487 1,281
Depreciation expense recorded under capital leases $ 273 $ 263