Debt - Finance Lease Obligations and Other - Narrative (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Subsidiary
Debt Instrument [Line Items]
Finance lease obligations	$ 1,180	$ 1,618

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.

No definition available.

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Balance Type:	na
Period Type:	duration