Acquisitions (Schedule of Acquired Intangible Assets) (Details) - USD ($) $ in Thousands	Feb. 13, 2020	Jan. 15, 2020	Aug. 30, 2019
Delta Separations
Acquired Finite-Lived Intangible Assets [Line Items]
Fair Value, finite-lived intangible assets acquired	$ 7,600
Delta Separations | Trademarks
Acquired Finite-Lived Intangible Assets [Line Items]
Fair Value, finite-lived intangible assets acquired	$ 2,000
Estimated Useful Life	5 years
Delta Separations | Technology
Acquired Finite-Lived Intangible Assets [Line Items]
Fair Value, finite-lived intangible assets acquired	$ 2,200
Estimated Useful Life	10 years
Delta Separations | Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Fair Value, finite-lived intangible assets acquired	$ 3,400
Estimated Useful Life	5 years
Thermo Energy Systems
Acquired Finite-Lived Intangible Assets [Line Items]
Fair Value, finite-lived intangible assets acquired		$ 9,386
Thermo Energy Systems | Trademarks
Acquired Finite-Lived Intangible Assets [Line Items]
Fair Value, finite-lived intangible assets acquired		$ 635
Estimated Useful Life		3 years
Thermo Energy Systems | Technology
Acquired Finite-Lived Intangible Assets [Line Items]
Fair Value, finite-lived intangible assets acquired		$ 2,541
Estimated Useful Life		15 years
Thermo Energy Systems | Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Fair Value, finite-lived intangible assets acquired		$ 6,210
Estimated Useful Life		10 years
Apeks
Acquired Finite-Lived Intangible Assets [Line Items]
Fair Value, finite-lived intangible assets acquired			$ 3,400
Apeks | Trademarks
Acquired Finite-Lived Intangible Assets [Line Items]
Fair Value, finite-lived intangible assets acquired			$ 1,900
Estimated Useful Life			5 years
Apeks | Technology
Acquired Finite-Lived Intangible Assets [Line Items]
Fair Value, finite-lived intangible assets acquired			$ 900
Estimated Useful Life			7 years
Apeks | Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Fair Value, finite-lived intangible assets acquired			$ 600
Estimated Useful Life			6 years