Quarterly report pursuant to Section 13 or 15(d)

Acquisitions - Narrative Sturgeon Acquisitions (Details)

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Acquisitions - Narrative Sturgeon Acquisitions (Details) - Sturgeon Acquisitions LLC - USD ($)
$ / shares in Units, $ in Millions
Jun. 05, 2017
Dec. 31, 2017
Business Acquisition [Line Items]    
Shares issued in acquisition (in shares) 5,607,452  
Business acquisition, share price (in dollars per share) $ 18.50  
Purchase price $ 103.7  
Transaction related costs expensed   $ 1.3