Goodwill and Other Intangible Assets (Schedule of intangible assets and goodwill) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended	12 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2020	Dec. 31, 2019
Finite-lived Intangible Assets [Roll Forward]
Finite-Lived Intangible Assets, Gross	$ 77,134		$ 77,134	$ 76,697
Accumulated amortization	(27,428)		(27,428)	(23,805)
Net carrying amount	181,302		181,302	180,934
Net carrying amount	49,706		49,706	52,892
Gross carrying amount	181,302		181,302	180,934
Accumulated amortization	0		0	0
Trade Names [Member]
Finite-lived Intangible Assets [Roll Forward]
Finite-Lived Intangible Assets, Gross	208		208	208
Accumulated amortization	(143)		(143)	(135)
Net carrying amount	65		65	73
Net carrying amount	$ 65		65	73
Trade Names [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired finite-lived intangible assets, weighted average useful life	6 years	6 years
Trade Names [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired finite-lived intangible assets, weighted average useful life	15 years	15 years
Developed Technology Rights [Member]
Finite-lived Intangible Assets [Roll Forward]
Finite-Lived Intangible Assets, Gross	$ 6,262		6,262	6,191
Accumulated amortization	(696)		(696)	(387)
Net carrying amount	5,566		5,566	5,804
Net carrying amount	$ 5,566		$ 5,566	$ 5,804
Developed Technology Rights [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired finite-lived intangible assets, weighted average useful life	10 years	10 years
Developed Technology Rights [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired finite-lived intangible assets, weighted average useful life	15 years	15 years
Intellectual Property [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired finite-lived intangible assets, weighted average useful life			15 years	15 years
Finite-lived Intangible Assets [Roll Forward]
Finite-Lived Intangible Assets, Gross	$ 1,250		$ 1,250	$ 1,250
Accumulated amortization	(48)		(48)	(7)
Net carrying amount	1,202		1,202	1,243
Net carrying amount	1,202		$ 1,202	$ 1,243
Customer Contracts [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired finite-lived intangible assets, weighted average useful life			6 years	6 years
Finite-lived Intangible Assets [Roll Forward]
Finite-Lived Intangible Assets, Gross	17,471		$ 17,471	$ 17,471
Accumulated amortization	(12,383)		(12,383)	(10,927)
Net carrying amount	5,088		5,088	6,544
Net carrying amount	5,088		5,088	6,544
Customer Relationships [Member]
Finite-lived Intangible Assets [Roll Forward]
Finite-Lived Intangible Assets, Gross	51,621		51,621	51,255
Accumulated amortization	(13,885)		(13,885)	(12,108)
Net carrying amount	37,736		37,736	39,147
Net carrying amount	$ 37,736		$ 37,736	$ 39,147
Customer Relationships [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired finite-lived intangible assets, weighted average useful life	8 years	8 years
Customer Relationships [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired finite-lived intangible assets, weighted average useful life	15 years	15 years
Other Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired finite-lived intangible assets, weighted average useful life			5 years	5 years
Finite-lived Intangible Assets [Roll Forward]
Finite-Lived Intangible Assets, Gross	$ 322		$ 322	$ 322
Accumulated amortization	(273)		(273)	(241)
Net carrying amount	49		49	81
Net carrying amount	49		49	81
MC Goodwill [Member]
Finite-lived Intangible Assets [Roll Forward]
Net carrying amount	67,689		67,689	67,672
Gross carrying amount	67,689		67,689	67,672
Accumulated amortization	0		0	0
AEC Goodwill [Member]
Finite-lived Intangible Assets [Roll Forward]
Net carrying amount	113,613		113,613	113,262
Gross carrying amount	113,613		113,613	113,262
Accumulated amortization	$ 0		$ 0	$ 0