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Shareholder's Equity - Distribution to Common Shareholders (Details) - USD ($) $ / shares in Units, $ in Thousands								9 Months Ended
	Oct. 18, 2018	Aug. 16, 2018	Jul. 19, 2018	May 17, 2018	Apr. 19, 2018	Feb. 22, 2018	Jan. 19, 2018	Sep. 30, 2018	Sep. 30, 2017
Stockholders' Equity Note [Abstract]
Dividends paid (in dollars per share)		$ 0.39		$ 0.39		$ 0.39
Distributions to shareholders		$ 92,681		$ 92,676		$ 92,674		$ 278,031	$ 277,932
Subsequent Event [Line Items]
Distributions to common shareholders declared (in dollars per share)			$ 0.39		$ 0.39		$ 0.39
Distribution payable			$ 92,681		$ 92,676		$ 92,674
Subsequent Event
Subsequent Event [Line Items]
Distributions to common shareholders declared (in dollars per share)	$ 0.39
Distribution payable	$ 92,715

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

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