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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

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- Definition Unrecorded Commitment to Fund Pre-development Costs, Annual Amount + References No definition available. + Details
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- 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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -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 + Details
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