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Significant Accounting Policies (Details 5)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2017
USD ($)
Sep. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Sep. 30, 2016
USD ($)
Jun. 30, 2016
USD ($)
Mar. 31, 2016
USD ($)
Dec. 31, 2017
USD ($)
facility
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Geographic concentrations                      
Number of facilities to provide services | facility                 32    
Net property, plant and equipment $ 21,787       $ 23,924       $ 21,787 $ 23,924  
Revenues 99,866 $ 94,424 $ 94,722 $ 94,894 110,107 $ 97,425 $ 97,317 $ 99,563 383,906 404,412 $ 444,166
Domestic                      
Geographic concentrations                      
Net property, plant and equipment 18,789       19,810       18,789 19,810  
Revenues                 $ 330,944 324,625 377,717
Foreign                      
Geographic concentrations                      
Number of facilities to provide services | facility                 6    
Net property, plant and equipment $ 2,998       $ 4,114       $ 2,998 4,114  
Revenues                 $ 52,962 $ 79,787 $ 66,449