The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Intangible Assets and Goodwill (Narrative) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Finite Lived Intangible Assets [Line Items]
Amortization expense, intangible assets			$ 186,000	$ 200,000
Goodwill, additions	$ 0	$ 0	0	0
Goodwill, Impairment Loss	$ 0	$ 0	$ 0	$ 0
Minimum [Member]
Finite Lived Intangible Assets [Line Items]
Finite-Lived intangible asset, useful life			1 year
Maximum [Member]
Finite Lived Intangible Assets [Line Items]
Finite-Lived intangible asset, useful life			8 years