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Financial Instruments - Fair Value Measurements (Details)
$ in Thousands
Jun. 30, 2019
USD ($)
Level 2 [Member]  
Fair Value of Financial Instruments [Abstract]  
Assets, fair value $ 0
Liabilities, fair value 0
Level 3 [Member]  
Fair Value of Financial Instruments [Abstract]  
Assets, fair value 0
Liabilities, fair value $ 0