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Related Party Transactions	3 Months Ended
	Mar. 31, 2017
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions Concurrently with the Company's public offering of Class A common shares in March 2017, the Chairman of our Board of Trustees, B. Wayne Hughes, purchased $50.0 million of our Class A common shares in a private placement at the public offering price.

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- Definition

The entire disclosure for related party transactions. Examples of related party transactions include transactions between (a) a parent company and its subsidiary; (b) subsidiaries of a common parent; (c) and entity and its principal owners; and (d) affiliates.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
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-Subparagraph (SX 210.4-08(k))
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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