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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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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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							9 Months Ended
	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	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	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Sep. 30, 2018	Sep. 30, 2017
Dividend Distributions
Paid																											$ 67,768	$ 67,664
Dividends declared and paid per common share (in dollars per share)																				$ 0.57				$ 0.57			$ 1.71	$ 1.71
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	$ 0.57	$ 0.57	$ 0.57	$ 0.57	$ 0.57	$ 0.57	$ 0.57
Common Stock
Dividend Distributions
Declared		$ 67,768									$ 67,664									$ 67,768				$ 67,664			$ 67,768	$ 67,664
Paid																											$ 67,768	$ 67,664
Common Stock \| Subsequent Event \| Dividend Payable, October 2018
Dividend Distributions
Dividends declared and paid per common share (in dollars per share)	$ 0.19
Common Stock \| Subsequent Event \| Dividend Payable, November 2018
Dividend Distributions
Dividends declared and paid per common share (in dollars per share)	0.19
Common Stock \| Subsequent Event \| Dividend Payable, December 2018 28, 2018
Dividend Distributions
Dividends declared and paid per common share (in dollars per share)	$ 0.19