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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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- Definition Aggregate dividends paid during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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- Definition 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). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6935-107765 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Current Liabilities -URI http://asc.fasb.org/extlink&oid=6509677 + Details
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- Definition 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). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average of per share prices paid for shares purchased on the open market for issuance to employees under the plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 + Details
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