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Related Party Transactions (Details) $ in Millions | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2017 USD ($) loan | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Feb. 28, 2017 item
Related party transactions |  |  |  |  |
Number of leased properties | item |  |  |  |  | 3
Mortgages |  |  |  |  |
Related party transactions |  |  |  |  |
Assumed notes |  | $ 4.2 |  |  |
SIGI |  |  |  |  |
Related party transactions |  |  |  |  |
Lease payments to related party |  | $ 0.2 | $ 0.8 | $ 0.8 |
Purchase of properties | $ 12.8 |  |  |  |
SIGI | Mortgages |  |  |  |  |
Related party transactions |  |  |  |  |
Number of mortgages assumed | loan | 3 |  |  |  |
Assumed notes | $ 4.2 |  |  |  |

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- Definition Represents the number of properties the Company is leasing. + References No definition available. + Details
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- Definition Represents the number of mortgages assumed. + References No definition available. + Details
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- Definition Amount of liabilities assumed at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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- Definition Amount of acquisition of long-lived, physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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- Definition Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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- Details
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