Intangible Assets, Net - Net Intangible Assets (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Net Balance	$ 5,417,000	$ 7,917,000
Impairment	$ 0	0	$ 0
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Useful Life (In Years)	10 years
Gross Carrying Amount	$ 25,002,000	25,002,000
Accumulated Amortization	(19,585,000)	(17,085,000)
Net Balance	$ 5,417,000	$ 7,917,000