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-Name Accounting Standards Codification

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

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-Section S99

-Paragraph 1

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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-Name Accounting Standards Codification

-Topic 230

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Common and Preferred Shares Common Shares (Details) (USD $) In Thousands, except Share data, unless otherwise specified	0 Months Ended	12 Months Ended
	Sep. 23, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Sep. 23, 2014
Cash Dividends Paid [Line Items]
Common Stock, Shares, Issued	3,680,000us-gaap_CommonStockSharesIssued	58,952,404us-gaap_CommonStockSharesIssued	53,361,261us-gaap_CommonStockSharesIssued		3,680,000us-gaap_CommonStockSharesIssued
Net proceeds from issuance of common shares	$ 184,200	$ 264,158	$ 220,785	$ 231
Common Stock [Member]
Cash Dividends Paid [Line Items]
Common stock declared dividends per share		$ 3.42	$ 3.16
Total Cash Distribution Per Share [Member] \| Common Stock [Member]
Cash Dividends Paid [Line Items]
Common Stock, Dividends, Per Share, Cash Paid		$ 3.3983	$ 3.6464
Taxable Ordinary Income [Member] \| Common Stock [Member]
Cash Dividends Paid [Line Items]
Common Stock, Dividends, Per Share, Cash Paid		$ 3.0364	$ 2.5994
Return of Capital [Member] \| Common Stock [Member]
Cash Dividends Paid [Line Items]
Common Stock, Dividends, Per Share, Cash Paid		$ 0.3619	$ 1.0470
direct share purchase plan [Member]
Cash Dividends Paid [Line Items]
Common Stock, Shares, Issued		1,563,709
Net proceeds from issuance of common shares		$ 79,500