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Fair Value of Financial Instruments - Narrative (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Fair Value Disclosures [Abstract]        
Fair value security, level 1 to level 2 transfers, amount $ 0 $ 0 $ 0 $ 0
Fair Value security, level 1 to level 3 transfers, amount $ 0 $ 0 $ 0 $ 0