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, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Dividends [Abstract]
Payment of cash dividends									$ 82,189	$ 80,581	$ 76,058
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 2018-Q1 [Member]
Dividends [Abstract]
Cash dividend paid (in dollars per share)								$ 0.365
Dividend Declared 2018-Q2 [Member]
Dividends [Abstract]
Cash dividend paid (in dollars per share)							$ 0.365
Dividend Declared 2018-Q3 [Member]
Dividends [Abstract]
Cash dividend paid (in dollars per share)						$ 0.365
Dividend Declared 2018-Q4 [Member]
Dividends [Abstract]
Cash dividend paid (in dollars per share)					$ 0.365
Dividend Declared 2020-Q1 [Member]
Dividends [Abstract]
Dividend payable per share (in dollars per share)									$ 0.375
Dividend payable, date to be paid									Mar. 11, 2020
Dividend payable, date of record									Feb. 28, 2020