Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies (Contract Balances) (Details)

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Summary of Significant Accounting Policies (Contract Balances) (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Accounting Policies [Abstract]    
Accounts receivable $ 75,207 $ 74,551
Short-term contract liabilities (deferred revenue) $ (4,536) $ (300)