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Leases - Narrative (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Jan. 01, 2019
Dec. 31, 2018
Operating Leased Assets [Line Items]      
Operating lease assets $ 50,935   $ 0
Operating lease, liability $ 50,836    
Accounting Standards Update 2016-02      
Operating Leased Assets [Line Items]      
Operating lease assets   $ 54,000  
Operating lease, liability   $ 54,000