Goodwill and Intangible Assets Goodwill and Intangible Assets - Narrative (Details) - USD ($)	3 Months Ended	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill	$ 0	$ 0	$ 0
Goodwill impairment	$ 4,700,000	0	4,675,000
Amortization of intangible assets		$ 400,000	$ 500,000