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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Carrying value as of the balance sheet date of dividends declared but unpaid on equity securities issued by the entity and outstanding.

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-Section S99
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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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Cash outflow in the form of capital distributions and dividends to common shareholders, preferred shareholders and noncontrolling interests.

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Equity - Class of Stock Disclosures - Dividends and AOCI (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended																																				3 Months Ended									12 Months Ended
	Dec. 31, 2018	Nov. 30, 2018	Oct. 31, 2018	Sep. 30, 2018	Aug. 31, 2018	Jul. 31, 2018	Jun. 30, 2018	May 31, 2018	Apr. 30, 2018	Mar. 31, 2018	Feb. 28, 2018	Jan. 31, 2018	Dec. 31, 2017	Nov. 30, 2017	Oct. 31, 2017	Sep. 30, 2017	Aug. 31, 2017	Jul. 31, 2017	Jun. 30, 2017	May 31, 2017	Apr. 30, 2017	Mar. 31, 2017	Feb. 28, 2017	Jan. 31, 2017	Dec. 31, 2016	Nov. 30, 2016	Oct. 31, 2016	Sep. 30, 2016	Aug. 31, 2016	Jul. 31, 2016	Jun. 30, 2016	May 31, 2016	Apr. 30, 2016	Mar. 31, 2016	Feb. 29, 2016	Jan. 31, 2016	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, 2018	Dec. 31, 2017	Dec. 31, 2016
Dividend Distributions
Paid																																														$ 90,372	$ 90,219	$ 84,568
Dividends declared and paid per common share (in dollars per share)																																						$ 0.57	$ 0.57	$ 0.57	$ 0.57	$ 0.57	$ 0.57	$ 0.57	$ 0.57
Dividends paid per common share (in dollars per share)																																						$ 0.57	$ 0.57	$ 0.57	$ 0.57	$ 0.57	$ 0.57	$ 0.57	$ 0.57	$ 2.280	$ 2.280	$ 2.190
Subsequent Event \| Dividend Payable, October 2018
Dividend Distributions
Dividends declared and paid per common share (in dollars per share)																																					$ 0.19
Dividends Payable, Date to be Paid																																					Jan. 31, 2019
Dividends Payable, Date of Record																																					Jan. 23, 2019
Subsequent Event \| Dividend Payable, November 2018
Dividend Distributions
Dividends declared and paid per common share (in dollars per share)																																					$ 0.19
Dividends Payable, Date to be Paid																																					Feb. 28, 2019
Dividends Payable, Date of Record																																					Feb. 20, 2019
Subsequent Event \| Dividend Payable, December 2018 28, 2018
Dividend Distributions
Dividends declared and paid per common share (in dollars per share)																																					$ 0.19
Dividends Payable, Date to be Paid																																					Mar. 29, 2019
Dividends Payable, Date of Record																																					Mar. 21, 2019
Common Stock
Dividend Distributions
Declared	$ 90,372												$ 90,219												$ 84,568													$ 90,372				$ 90,219				$ 90,372	$ 90,219	$ 84,568
Paid																																														$ 90,372	$ 90,219	$ 84,568
Dividends declared and paid per common share (in dollars per share)	$ 0.19	$ 0.19	$ 0.19	$ 0.19	$ 0.19	$ 0.19	$ 0.19	$ 0.19	$ 0.19	$ 0.19	$ 0.19	$ 0.19	$ 0.19	$ 0.19	$ 0.19	$ 0.19	$ 0.19	$ 0.19	$ 0.19	$ 0.19	$ 0.19	$ 0.19	$ 0.19	$ 0.19	$ 0.19	$ 0.19	$ 0.19	$ 0.18	$ 0.18	$ 0.18	$ 0.18	$ 0.18	$ 0.18	$ 0.18	$ 0.18	$ 0.18
Dividends paid per common share (in dollars per share)	$ 0.19	$ 0.19	$ 0.19	$ 0.19	$ 0.19	$ 0.19	$ 0.19	$ 0.19	$ 0.19	$ 0.19	$ 0.19	$ 0.19	$ 0.19	$ 0.19	$ 0.19	$ 0.19	$ 0.19	$ 0.19	$ 0.19	$ 0.19	$ 0.19	$ 0.19	$ 0.19	$ 0.19	$ 0.19	$ 0.19	$ 0.19	$ 0.18	$ 0.18	$ 0.18	$ 0.18	$ 0.18	$ 0.18	$ 0.18	$ 0.18	$ 0.18