Goodwill and Intangible Assets Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill recognized and expected to be deductible for income tax purposes	$ 0
Amortization expense	$ 2,300,000	$ 2,800,000	$ 3,500,000