Goodwill and Other Intangible Assets (Schedule of intangible assets and goodwill) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Mar. 31, 2019	Dec. 31, 2018
Amortized intangible assets:
Gross carrying value	$ 66,724	$ 66,724
Accumulated amortization	(19,078)	(17,518)
Net carrying amount	47,646	49,206
Goodwill
Gross carrying value	163,438	164,382
Accumulated amortization
Net carrying amount	163,438	164,382
AEC Trade Names [Member]
Amortized intangible assets:
Gross carrying value	140	140
Accumulated amortization	(131)	(129)
Net carrying amount	$ 9	$ 11
Goodwill
Amortization life in years	15 years	15 years
AEC Technology [Member]
Amortized intangible assets:
Gross carrying value	$ 370	$ 370
Accumulated amortization	(321)	(314)
Net carrying amount	$ 49	$ 56
Goodwill
Amortization life in years	15 years	15 years
Customer Relationships [Member]
Amortized intangible assets:
Gross carrying value	$ 48,421	$ 48,421
Accumulated amortization	(9,690)	(8,883)
Net carrying amount	$ 38,731	$ 39,538
Goodwill
Amortization life in years	15 years	15 years
Customer Contracts [Member]
Amortized intangible assets:
Gross carrying value	$ 17,471	$ 17,471
Accumulated amortization	(8,743)	(8,015)
Net carrying amount	$ 8,728	$ 9,456
Goodwill
Amortization life in years	6 years	6 years
Other Intangible [Member]
Amortized intangible assets:
Gross carrying value	$ 322	$ 322
Accumulated amortization	(193)	(177)
Net carrying amount	$ 129	$ 145
Goodwill
Amortization life in years	5 years	5 years
MC Goodwill [Member]
Goodwill
Gross carrying value	$ 67,708	$ 68,652
Accumulated amortization
Net carrying amount	67,708	68,652
AEC Goodwill [Member]
Goodwill
Gross carrying value	95,730	95,730
Accumulated amortization
Net carrying amount	$ 95,730	$ 95,730

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- Definition

Accumulated amortization of goodwill.

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Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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-Publisher FASB
-Name Accounting Standards Codification
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Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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The current portion of nonphysical assets, excluding financial assets, if these assets are classified into the current and noncurrent portions.

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