Annual report pursuant to Section 13 and 15(d)

SEGMENT INFORMATION, MAJOR CUSTOMERS AND GEOGRAPHICAL DATA Schedule of Revenue from External Customers and Long-Lived Assets (Details)

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SEGMENT INFORMATION, MAJOR CUSTOMERS AND GEOGRAPHICAL DATA Schedule of Revenue from External Customers and Long-Lived Assets (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Revenues $ 52,016 $ 54,610 $ 57,728 $ 57,322 $ 57,531 $ 61,385 $ 57,878 $ 54,527 $ 221,676 $ 231,321 $ 247,228
Net property and equipment 599,194       673,914       599,194 673,914  
United States                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Revenues                 157,267 152,187 171,121
Net property and equipment 472,838       533,800       472,838 533,800  
Latin America and the Caribbean                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Revenues                 58,037 68,936 64,007
Net property and equipment 105,519       120,152       105,519 120,152  
Europe                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Revenues                 608 5,029 5,924
Net property and equipment 8,049       6,697       8,049 6,697  
Asia                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Revenues                 5,764 5,169 $ 6,176
Net property and equipment $ 12,788       $ 13,265       $ 12,788 $ 13,265