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Equity - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Oct. 31, 2016
Equity, Class of Treasury Stock [Line Items]
Purchase of treasury stock	$ 1,485	$ 3,876
Treasury Stock
Equity, Class of Treasury Stock [Line Items]
Purchase of Treasury Stock	60,833	118,645
Purchase of treasury stock	$ 1,485	$ 3,876
Class B Shares
Equity, Class of Treasury Stock [Line Items]
Number of shares authorized under share repurchase program			4,000,000
Purchase of Treasury Stock	61,000
Remaining number of shares authorized to be repurchased	1,000,000

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The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

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Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

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