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
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section S99
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Name:	us-gaap_TreasuryStockValueAcquiredCostMethod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Capital Structure - Share Repurchase Program (Details) - USD ($) shares in Millions		12 Months Ended			20 Months Ended
	Jul. 27, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Sep. 30, 2019	Feb. 28, 2018
Class of Stock [Line Items]
Authorized repurchase amount	$ 100,000,000.0
Increase in authorized repurchase amount	$ 50,000,000.0
Value of shares repurchased		$ 15,878,000	$ 66,218,000	$ 2,683,000
Class A
Class of Stock [Line Items]
Authorized repurchase amount						$ 50,000,000.0
Number of shares repurchased					2.6
Value of shares repurchased					$ 65,900,000