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
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
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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
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-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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

Shareholders' Equity (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended			135 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2019	Feb. 04, 2020
Equity, Class of Treasury Stock [Line Items]
Stock repurchase program, authorized amount	$ 69,417			$ 69,417
Common stock surrendered as payment	198,563	$ 166,147	$ 285,020	$ 2,600,000
Repurchases in Accordance with Stock Award Agreements [Member]
Equity, Class of Treasury Stock [Line Items]
Common stock surrendered as payment	$ 10,420	$ 5,411	$ 702
Subsequent Event [Member]
Equity, Class of Treasury Stock [Line Items]
Stock repurchase program, authorized amount					$ 100,000