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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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Name:	us-gaap_TreasuryStockValueAcquiredCostMethod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Stockholders' Equity and Earnings Per Share (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Nov. 06, 2019	May 31, 2018
Class of Stock [Line Items]
Shares repurchased (in shares)	364,893	0	0
Shares repurchased	$ 5,960
Stock Repurchase Program \| Class A Common Stock
Class of Stock [Line Items]
Approved repurchase amount (up to)				25,000,000.0	25,000,000.0