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Debt - Cabot Senior Revolving Credit Facility (Details) |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Nov. 11, 2015 GBP (£) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2017 GBP (£) | Dec. 12, 2017 USD ($) | Dec. 12, 2017 GBP (£) | Sep. 20, 2012 GBP (£)
Debt Instrument [Line Items] |  |  |  |  |  |  |
Weighted average interest rate |  | 4.03% | 3.56% |  |  |  |
Cabot Credit Agreement |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Revolving credit facility |  |  |  |  |  |  | £ 50,000,000.0
Revolving Credit Facility |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Revolving credit facility | $ |  | $ 794,600,000.0 |  |  |  |  |
Cabot senior revolving credit facility |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Maximum loan to value ratio | 0.75% |  |  |  |  |  |
Outstanding borrowings for credit facility | $ |  | $ 179,008,000 | $ 33,218,000 |  |  |  |
Weighted average interest rate |  | 3.60% | 3.95% |  |  |  |
Senior Loans | Cabot senior revolving credit facility |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Maximum loan to value ratio | 25.00% |  |  |  |  |  |
LIBOR | Cabot senior revolving credit facility |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument, initial spread percentage | 3.25% |  |  |  |  |  |
Debt instrument, alternate basis spread on variable rate | 2.75% |  |  |  |  |  |
LIBOR | Minimum |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument, initial spread percentage |  | 2.50% |  |  |  |  |
Cabot Credit Agreement, Tranche with Expiration in September 2019 | Secured Debt | Revolving Credit Facility |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Revolving credit facility |  |  |  | £ 245,000,000 |  | £ 245,000,000.0 |
Cabot Credit Agreement | Secured Debt |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Revolving credit facility | £ 250,000,000.0 |  |  |  | $ 395,200,000 | £ 295,000,000 |
Cabot Credit Agreement | Secured Debt | Revolving Credit Facility |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Maximum utilization of credit facility |  | 20.00% |  |  |  |  |
Cabot Credit Agreement | Senior Loans | Revolving Credit Facility |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Maximum utilization of credit facility | 20.00% |  |  |  |  |  |
Cabot Credit Agreement, Tranche with Expiration in March 2022 | Secured Debt | Revolving Credit Facility |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Revolving credit facility |  |  |  | £ 50,000,000.0 |  |  |

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- Definition Line of Credit Facility, Covenant Terms, Loan-to-Value Credit Facility Utilization Trigger + References No definition available. + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + 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(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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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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