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Business Combinations - Consideration Transferred (Details) - USD ($) $ in Thousands	Sep. 17, 2019	Sep. 30, 2019	Dec. 31, 2018	Dec. 31, 2017
Business Combination, Consideration Transferred [Abstract]
Goodwill		$ 25,188	$ 7,576	$ 8,045
FSE Acquisition
Business Combination, Consideration Transferred [Abstract]
Initial cash paid, net of working capital adjustment	$ 34,000
Contingent consideration at fair value	4,700
Total consideration	38,700
Net assets at fair value	21,025
Goodwill	$ 17,675