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Basis of Presentation - Fair Value (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Jun. 30, 2016
Fair value of financial instruments    
Liabilities - Contingent payment obligations $ 17,100 $ 17,100
Property and Equipment    
Net value of turnkey security screening program assets at Mexico 15,000  
Recurring    
Fair value of financial instruments    
Equity securities 384 354
Insurance company contracts 22,443 21,353
Interest rate contract (13) (31)
Total assets 22,814 21,676
Liabilities - Contingent payment obligations 17,117 17,117
Recurring | Level 1    
Fair value of financial instruments    
Equity securities 384 354
Total assets 384 354
Recurring | Level 2    
Fair value of financial instruments    
Insurance company contracts 22,443 21,353
Interest rate contract (13) (31)
Total assets 22,430 21,322
Recurring | Level 3    
Fair value of financial instruments    
Total assets 0 0
Liabilities - Contingent payment obligations $ 17,117 $ 17,117