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, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Dividends [Abstract]
Payment of cash dividends									$ 80,581	$ 76,058	$ 78,438
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 2017-Q1 [Member]
Dividends [Abstract]
Cash dividend paid (in dollars per share)								$ 0.36
Dividend Declared 2017-Q2 [Member]
Dividends [Abstract]
Cash dividend paid (in dollars per share)							$ 0.36
Dividend Declared 2017-Q3 [Member]
Dividends [Abstract]
Cash dividend paid (in dollars per share)						$ 0.36
Dividend Declared 2017-Q4 [Member]
Dividends [Abstract]
Cash dividend paid (in dollars per share)					$ 0.36
Dividend Declared 2019 Q1 [Member]
Dividends [Abstract]
Dividend payable per share (in dollars per share)									$ 0.37
Dividend payable, date to be paid									Mar. 13, 2019
Dividend payable, date of record									Feb. 25, 2019