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Leases - Narrative (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended
Aug. 31, 2013
Mar. 31, 2019
Mar. 31, 2018
Lessee, Lease, Description [Line Items]      
Lease term 120 months    
Cash paid for operating lease liabilities   $ 4.4  
Operating lease rent expense     $ 2.8
Minimum      
Lessee, Lease, Description [Line Items]      
Lease, renewal term   3 months  
Maximum      
Lessee, Lease, Description [Line Items]      
Lease, renewal term   10 years