Capital Stock, Repurchase of Common Stock (Details) - USD ($) $ in Thousands, shares in Millions	3 Months Ended
Mar. 31, 2021	Mar. 31, 2020
Repurchases of Common Stock [Abstract]
Class A common stock repurchased	$ 50,406	$ 60,886
Amount available for repurchases	$ 275,400
Treasury Stock [Member]
Repurchases of Common Stock [Abstract]
Class A common stock repurchased (in shares)	1.0	2.6
Class A common stock repurchased	$ 50,406	$ 60,886

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
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 30
-Section 45
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration