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	$ 13,900
Delta Separations | Trademarks
Acquired Finite-Lived Intangible Assets [Line Items]
Fair Value, finite-lived intangible assets acquired	6,900
Delta Separations | Technology
Acquired Finite-Lived Intangible Assets [Line Items]
Fair Value, finite-lived intangible assets acquired	$ 3,200
Estimated Useful Life	10 years
Delta Separations | Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Fair Value, finite-lived intangible assets acquired	$ 3,200
Estimated Useful Life	11 years
Delta Separations | Non-compete agreements
Acquired Finite-Lived Intangible Assets [Line Items]
Fair Value, finite-lived intangible assets acquired	$ 300
Estimated Useful Life	5 years
Delta Separations | Backlog
Acquired Finite-Lived Intangible Assets [Line Items]
Fair Value, finite-lived intangible assets acquired	$ 300
Estimated Useful Life	3 months
Thermo Energy Systems
Acquired Finite-Lived Intangible Assets [Line Items]
Fair Value, finite-lived intangible assets acquired		$ 10,102
Thermo Energy Systems | Trademarks
Acquired Finite-Lived Intangible Assets [Line Items]
Fair Value, finite-lived intangible assets acquired		$ 1,122
Estimated Useful Life		3 years
Thermo Energy Systems | Technology
Acquired Finite-Lived Intangible Assets [Line Items]
Fair Value, finite-lived intangible assets acquired		$ 3,218
Estimated Useful Life		10 years
Thermo Energy Systems | Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Fair Value, finite-lived intangible assets acquired		$ 4,939
Estimated Useful Life		12 years
Thermo Energy Systems | Non-compete agreements
Acquired Finite-Lived Intangible Assets [Line Items]
Fair Value, finite-lived intangible assets acquired		$ 224
Estimated Useful Life		5 years
Thermo Energy Systems | Backlog
Acquired Finite-Lived Intangible Assets [Line Items]
Fair Value, finite-lived intangible assets acquired		$ 599
Estimated Useful Life		9 months
Apeks
Acquired Finite-Lived Intangible Assets [Line Items]
Fair Value, finite-lived intangible assets acquired			$ 3,000
Apeks | Trademarks
Acquired Finite-Lived Intangible Assets [Line Items]
Fair Value, finite-lived intangible assets acquired			1,400
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			$ 700
Estimated Useful Life			6 years