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Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	duration

Stock repurchases (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Apr. 01, 2013
Stock repurchases
Remaining amount authorized for the share repurchase program	$ 5,180
Maximum
Stock repurchases
Amount of common stock approved by the entity for a stock repurchase program		$ 10,000