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Commitments and Contingencies - Letters of Credit and Guarantees (Details) - USD ($) | Jun. 30, 2017 | Apr. 28, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Financial Guarantee |  |  |
Loss contingencies |  |  |
Letters of credit outstanding | $ 34,400,000 |  | $ 28,700,000
Uncommitted Letter of Credit and Reimbursement Agreement | Letter of Credit |  |  |
Loss contingencies |  |  |
Maximum borrowing capacity |  | $ 30,000,000.0 |

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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Balance Type: | credit
Period Type: | instant

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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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- Details
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