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Selected Quarterly Financial Data (Unaudited) - Narrative (Details) - Corporate Office Relocation - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Sep. 30, 2017	Dec. 31, 2018	Dec. 31, 2017
Interim Period
Additions for costs expensed		$ 0	$ 2,113
Remaining lease costs
Interim Period
Additions for costs expensed	$ 1,300		$ 1,258

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- Definition

Relocation Expenses Incurred

+ References

No definition available.

+ Details

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Period Type:	duration

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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.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Period Type: