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Commitments and Contingencies Boyd Commitments (Details) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	Sep. 30, 2011	Dec. 31, 2017
Other Commitments [Line Items]
Purchase price		$ 1.2
Development Agreement
Other Commitments [Line Items]
Purchase price	$ 24.5
Minimum
Other Commitments [Line Items]
Obligation to fund certain pre-development costs, annual amount		1.0
Maximum
Other Commitments [Line Items]
Obligation to fund certain pre-development costs, annual amount		$ 2.0

X

- Definition

Unrecorded Commitment to Fund Pre-development Costs, Annual Amount

+ References

No definition available.

+ Details

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X

- Definition

Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 30
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 30
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477

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- Definition

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+ References

No definition available.

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