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Summary of Significant Accounting Policies - Leases (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Jan. 01, 2019
Summary of Significant Accounting Policies    
Operating lease right-of-use assets $ 8,768 $ 9,200
Operating lease liabilities $ 10,927 $ 11,000
Lease, Practical Expedients, Package [true false] true