XML 42 R31.htm IDEA: XBRL DOCUMENT v3.8.0.1
DIVESTITURE (Divestiture) (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended
Mar. 31, 2018
Apr. 01, 2018
Apr. 02, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Divestiture of business   $ 8,500 $ 0
Divestiture non-cash consideration   1,957 0
Revenue from services   554,388 $ 568,244
PlaneTechs      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Divestiture, amount of consideration received $ 11,400    
Divestiture of business 8,500    
Divestiture non-cash consideration $ 1,600    
Gain on disposition of assets   1,400  
Revenue from services   $ 8,000