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Equity (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Oct. 31, 2016
Equity, Class of Treasury Stock [Line Items]
Purchase of treasury stock	$ 26,917	$ 42,321
Treasury Stock
Equity, Class of Treasury Stock [Line Items]
Purchase of treasury stock	$ 26,917	$ 42,321
Class B
Equity, Class of Treasury Stock [Line Items]
Number of shares authorized under share repurchase program			4,000,000
Repurchased shares (in shares)	1,100,000
Remaining number of shares authorized to be repurchased	1,100,000

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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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