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Property, Plant and Equipment - Additional Information (Details) - USD ($)	3 Months Ended	12 Months Ended
	Sep. 30, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Sep. 30, 2018
Property, Plant and Equipment [Line Items]
Impairment		$ 0	$ 0	$ 0
International Services
Property, Plant and Equipment [Line Items]
Assets held-for-sale, recognized loss	$ 300,000
International Services | Buildings and improvements
Property, Plant and Equipment [Line Items]
Assets held-for-sale, net book value	$ 4,100,000	$ 4,200,000			$ 5,000,000

X

- Definition

Amount of assets held-for-sale that are not part of a disposal group.

+ References

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- Definition

The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale).

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The charge against earnings resulting from the aggregate write down of tangible assets from their carrying value to their fair value.

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