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

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

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Date the declared dividend will be paid, in CCYY-MM-DD format.

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Date the holder must own the stock to be entitled to the dividend, in CCYY-MM-DD format.

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Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity.

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Capital Stock, Dividends (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	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
Dividends [Abstract]
Payment of cash dividends									$ 78,387	$ 82,189	$ 80,581
Dividend Declared 2020-Q1 [Member]
Dividends [Abstract]
Cash dividend paid (in dollars per share)				$ 0.375
Dividend Declared 2020-Q2 [Member]
Dividends [Abstract]
Cash dividend paid (in dollars per share)			$ 0.375
Dividend Declared 2020-Q3 [Member]
Dividends [Abstract]
Cash dividend paid (in dollars per share)		$ 0.375
Dividend Declared 2020-Q4 [Member]
Dividends [Abstract]
Cash dividend paid (in dollars per share)	$ 0.375
Dividend Declared 2019-Q1 [Member]
Dividends [Abstract]
Cash dividend paid (in dollars per share)								$ 0.37
Dividend Declared 2019-Q2 [Member]
Dividends [Abstract]
Cash dividend paid (in dollars per share)							$ 0.37
Dividend Declared 2019-Q3 [Member]
Dividends [Abstract]
Cash dividend paid (in dollars per share)						$ 0.37
Dividend Declared 2019-Q4 [Member]
Dividends [Abstract]
Cash dividend paid (in dollars per share)					$ 0.37
Dividend Declared 2021-Q1 [Member]
Dividends [Abstract]
Dividend payable per share (in dollars per share)									$ 0.38
Dividend payable, date to be paid									Mar. 10, 2021
Dividend payable, date of record									Feb. 26, 2021