Other Intangibles and Long-Lived Assets - Schedule of Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets	$ 76,703		$ 77,204
Less accumulated amortization and impairment	(69,510)		(69,490)
Intangible assets, net	7,193		7,714
Amortization expense of intangible assets	600	$ 500
Customer lists
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets	73,192		73,678
Less accumulated amortization and impairment	$ (66,382)		(66,382)
Weighted Average Life in Years	13 years 7 months 6 days
Non-competition agreements
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets	$ 944		959
Less accumulated amortization and impairment	$ (944)		(959)
Weighted Average Life in Years	4 years 1 month 6 days
Trade names
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets	$ 2,510		2,510
Less accumulated amortization and impairment	$ (2,133)		(2,098)
Weighted Average Life in Years	13 years 3 months 18 days
Patents
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets	$ 57		57
Less accumulated amortization and impairment	$ (51)		$ (51)
Weighted Average Life in Years	9 years