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

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Amount of assets, excluding financial assets and goodwill, that lack physical substance, having a projected indefinite period of benefit, acquired at the acquisition date.

+ References

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-Publisher FASB
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- Definition

The amount of identifiable intangible assets recognized as of the acquisition date.

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Business Combinations - Intangible Assets Acquired (Details) - USD ($) $ in Thousands	May 01, 2018	Aug. 16, 2017	Jun. 30, 2019	Dec. 31, 2018	Sep. 30, 2018	Dec. 31, 2017
EPMH
Business Acquisition [Line Items]
Identifiable intangible assets - finite lived, Approximate Fair Value	$ 8,770		$ 8,770	$ 10,270
Identifiable intangible assets - indefinite lived, Approximate Fair Value			$ 36,800	$ 38,050
EPMH \| Trade names
Business Acquisition [Line Items]
Identifiable intangible assets - indefinite lived, Approximate Fair Value	36,800
EPMH \| Intellectual property
Business Acquisition [Line Items]
Identifiable intangible assets - finite lived, Approximate Fair Value	$ 1,400
Identifiable intangible assets - finite lived, Estimated Useful Life (in years)	15 years
EPMH \| Customer relationships
Business Acquisition [Line Items]
Identifiable intangible assets - finite lived, Approximate Fair Value	$ 7,370
Identifiable intangible assets - finite lived, Estimated Useful Life (in years)	15 years
MS Sand
Business Acquisition [Line Items]
Identifiable intangible assets - finite lived, Approximate Fair Value					$ 1,840	$ 1,840
MS Sand \| Customer relationships
Business Acquisition [Line Items]
Identifiable intangible assets - finite lived, Approximate Fair Value		$ 1,840
Identifiable intangible assets - finite lived, Estimated Useful Life (in years)		15 years