Shareholders' Equity (Details) - USD ($) $ in Thousands	6 Months Ended
Jun. 30, 2020	Jun. 30, 2019
Stock Repurchase Program [Abstract]
Stock repurchase program, shares authorized (in shares)	2,464,209
Stock repurchase program, authorized amount	$ 25,000
Stock repurchase program, authorized amount per quarter	6,250
Repurchase of common shares	$ 1,782	$ 6,487
Class B [Member]
Stock Repurchase Program [Abstract]
Repurchase of common stock (in shares)	126,764

Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration