Goodwill and Other Intangible Assets Other Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Intangible Assets [Line Items]
Other intangible assets, gross	$ 16,610	$ 15,802
Less: Accumulated amortization (Finite-lived intangible assets)	(3,387)	(2,476)
Finite and Indefinite lived intangible assets, net	13,223	13,326
Amortization of Intangible Assets	976	1,012	$ 400
Other intangible assets, future amortization expense [Abstract]
2018	1,080
2019	905
2020	833
2021	353
2022	163
Npt tradename [Member]
Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	$ 1,500	1,500
Useful life	20 years
Noncompete agreements [Member]
Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	$ 5,078	4,396
Weighted average useful life	5 years
Patents [Member]
Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	$ 523	483
Weighted average useful life	5 years
Horizon tradename [Member]
Intangible Assets [Line Items]
Indefinite-Lived Intangible Assets (Excluding Goodwill)	$ 8,400	8,400
Pool System tradename and trademarks [Member]
Intangible Assets [Line Items]
Indefinite-Lived Intangible Assets (Excluding Goodwill)	$ 1,109	$ 1,023