Segment Information (Narrative) (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($) segment	Jun. 30, 2019 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment			2
Revenues	$ 53,771,000	$ 71,139,000	$ 120,200,000	$ 138,644,000
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenues			$ 0