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Consolidated Statements of Stockholders' Equity Parenthetical - $ / shares	3 Months Ended														12 Months Ended
	Dec. 31, 2019		Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018		Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement of Stockholders' Equity [Abstract]
Dividends declared per common share	$ 1.10	[1]	$ 0.09	$ 0.09	$ 0.09	$ 0.09	$ 1.07	[1]	$ 0.07	$ 0.07	$ 0.07	$ 0.00	$ 0.00	$ 0.00	$ 1.37	$ 1.30	$ 0.07
[1] During each fourth quarter 2019 and third quarter 2018, our board of directors declared and paid a supplemental dividend of $1.00 per share of our common stock.

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- 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=27012166&loc=d3e187085-122770

+ Details

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- References

No definition available.

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