Business Combinations (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended							12 Months Ended
	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018	Jun. 30, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Dec. 31, 2019	Dec. 31, 2018
Acquired Finite-Lived Intangible Assets [Line Items]
Restricted cash	$ 2,914		$ 0					$ 2,914	$ 0
Adjustments to goodwill during the measurement period								448	(2,362)
Goodwill acquired								19,076	47,705
Goodwill	82,092		$ 100,722		$ 55,831			82,092	$ 100,722
SND
Acquired Finite-Lived Intangible Assets [Line Items]
Consideration transferred		$ 19,560
Restricted cash	2,914	2,934						2,914
Decrease in intangible assets	9,650
Adjustments to goodwill during the measurement period	9,650
Decrease in amortization expense	848
Decrease in accumulated amortization	848
Goodwill acquired		19,076
SND | Licensing Agreements
Acquired Finite-Lived Intangible Assets [Line Items]
Restricted cash	$ 1,861	1,956						$ 1,861
Genesis Systems
Acquired Finite-Lived Intangible Assets [Line Items]
Ownership percentage acquired			100.00%						100.00%
Purchase price			$ 107,987						$ 107,987
Working capital adjustment		$ 448
Escrow deposit			1,350						1,350
Goodwill			45,684						$ 45,684
Genesis Systems | Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired			$ 32,350
Acquired intangible asset, useful life			11 years
Genesis Systems | Technology, trademark and trade name
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired			$ 11,350
Acquired intangible asset, useful life			6 years
RC
Acquired Finite-Lived Intangible Assets [Line Items]
Ownership percentage acquired				100.00%
Purchase price				$ 4,453
Goodwill				4,072
RC | Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired				$ 111
Acquired intangible asset, useful life				1 year
RC | Technology, trademark and trade name
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired				$ 594
Acquired intangible asset, useful life				10 years
LDD
Acquired Finite-Lived Intangible Assets [Line Items]
Ownership percentage acquired					100.00%
Purchase price					$ 9,992
Goodwill					5,276
LDD | Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired					$ 1,006
Acquired intangible asset, useful life					6 years
LDD | Technology, trademark and trade name
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired					$ 2,608
Acquired intangible asset, useful life					6 years
ILT
Acquired Finite-Lived Intangible Assets [Line Items]
Ownership percentage acquired						100.00%
Purchase price						$ 40,256
Goodwill						19,467
ILT | Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired						$ 11,660
Acquired intangible asset, useful life						13 years
ILT | Technology, trademark and trade name
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired						$ 7,480
Acquired intangible asset, useful life						8 years
OptiGrate
Acquired Finite-Lived Intangible Assets [Line Items]
Ownership percentage acquired							100.00%
Purchase price							$ 16,870
Goodwill							8,900
OptiGrate | Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired							$ 1,010
Acquired intangible asset, useful life							4 years
OptiGrate | Technology, trademark and trade name
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired							$ 4,650
Acquired intangible asset, useful life							9 years