Intangible Assets, Net - Net Consolidated Balance of Amortizable Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Useful Life (In Years)	10 years
Total amortizable intangible assets	$ 4,792	$ 5,417
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Useful Life (In Years)	10 years
Gross Carrying Amount	$ 25,002
Accumulated Amortization	(20,210)
Total amortizable intangible assets	$ 4,792