Share Repurchase Plan - Narrative (Details) - USD ($)	8 Months Ended	12 Months Ended
Dec. 31, 2016	Dec. 31, 2018	Dec. 31, 2017	May 31, 2016
Equity [Abstract]
Amount authorized by the company's Board of Directors (not more than)			$ 30,000,000	$ 30,000,000
Common stock purchased under share repurchase program (in shares)	305,183	0	0

Number of shares that have been repurchased during the period and are being held in treasury.

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-Name Accounting Standards Codification
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Name:	us-gaap_TreasuryStockSharesAcquired
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration