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Shareholders' Equity (Details) $ / shares in Units, $ in Thousands								9 Months Ended
	Oct. 21, 2016 USD ($) $ / shares	Sep. 26, 2016 $ / shares shares	Sep. 15, 2016 $ / shares shares	Aug. 18, 2016 USD ($) $ / shares	May 19, 2016 USD ($) $ / shares	May 18, 2016 trustee $ / shares shares	Feb. 23, 2016 USD ($) $ / shares	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)
Subsequent Event [Line Items]
Distribution to common shareholders (in dollars per share)				$ 0.39	$ 0.39		$ 0.39
Distribution to common shareholders | $				$ 92,619	$ 92,614		$ 92,614	$ 277,846	$ 263,770
Number of trustees | trustee						5
Shares paid for tax withholding for share based compensation (in shares) | shares		17,667
Share-based compensation, per share price of shares purchased (in dollars per share)		$ 23.53
Subsequent Event
Subsequent Event [Line Items]
Common stock dividends payable | $	$ 92,643
Common stock dividend declared (in dollars per share)	$ 0.39
Stock Compensation Plan
Subsequent Event [Line Items]
Share-based compensation, equity instruments other than options, grants in period (in shares) | shares						2,500
Share-based compensation, equity instruments other than options, grants in period, weighted average grant date fair value (in dollars per share)						$ 18.26
Stock Compensation Plan | Officers and Certain Employees
Subsequent Event [Line Items]
Share-based compensation, equity instruments other than options, grants in period (in shares) | shares			79,650
Share-based compensation, equity instruments other than options, grants in period, weighted average grant date fair value (in dollars per share)			$ 21.64

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Number of Trustees

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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. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average of per share prices paid for shares purchased on the open market for issuance to employees under the plan.

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For net-share settlement of share-based awards when the employer settles employees' income tax withholding obligations, this element represents the number of shares the employees use to repay the employer.

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