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Stockholders' Equity - Dividends (Details) - $ / shares													3 Months Ended								12 Months Ended
	Oct. 21, 2020	Jul. 22, 2020	Apr. 29, 2020	Jan. 22, 2020	Oct. 23, 2019	Jul. 24, 2019	Apr. 24, 2019	Jan. 23, 2019	Oct. 24, 2018	Jul. 24, 2018	Apr. 25, 2018	Jan. 24, 2018	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Subsequent Event [Line Items]
Declared	Oct. 21, 2020	Jul. 22, 2020	Apr. 29, 2020	Jan. 22, 2020	Oct. 23, 2019	Jul. 24, 2019	Apr. 24, 2019	Jan. 23, 2019	Oct. 24, 2018	Jul. 24, 2018	Apr. 25, 2018	Jan. 24, 2018
Cash dividends declared on common stock (in usd per share)	$ 0.20	$ 0.20	$ 0.20	$ 0.20	$ 0.19	$ 0.19	$ 0.18	$ 0.18	$ 0.17	$ 0.15	$ 0.15	$ 0.15	$ 0.20	$ 0.20	$ 0.20	$ 0.20	$ 0.29	$ 0.19	$ 0.18	$ 0.18	$ 0.80	$ 0.84	$ 0.72
Record Date	Nov. 04, 2020	Aug. 05, 2020	May 13, 2020	Feb. 06, 2020	Nov. 07, 2019	Aug. 08, 2019	May 08, 2019	Feb. 07, 2019	Nov. 07, 2018	Aug. 09, 2018	May 10, 2018	Feb. 07, 2018
Paid Date	Nov. 18, 2020	Aug. 19, 2020	May 27, 2020	Feb. 20, 2020	Nov. 21, 2019	Aug. 22, 2019	May 22, 2019	Feb. 21, 2019	Nov. 21, 2018	Aug. 23, 2018	May 24, 2018	Feb. 21, 2018
Special Dividend
Subsequent Event [Line Items]
Declared					Oct. 23, 2019				Oct. 24, 2018
Cash dividends declared on common stock (in usd per share)					$ 0.10				$ 0.10
Record Date					Nov. 07, 2019				Nov. 07, 2018
Paid Date					Nov. 21, 2019				Nov. 21, 2018

X

- Definition

Aggregate dividends declared during the period for each share of common stock outstanding.

+ References

Reference 1: 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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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4304-108586

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-Topic 230
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