Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
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-Subparagraph (SX 210.9-03(11))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
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-Section 50
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

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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.

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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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
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- Definition

Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

+ References

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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.

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- Definition

Weighted average interest rate of long-term debt outstanding calculated over time.

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No definition available.

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Debt, Net - Cabot Securitisation Senior Facility (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019 USD ($)	Jun. 30, 2018	Jun. 30, 2019 USD ($)	Jun. 30, 2019 GBP (£)	Dec. 31, 2018 USD ($)	Nov. 30, 2018 USD ($)
Debt Instrument [Line Items]
Book value \| $	$ 4,811,025		$ 4,811,025		$ 4,631,875
Cabot securitisation senior facilities
Debt Instrument [Line Items]
Facility agreement, borrowing capacity \| £				£ 300,000,000.0
Current borrowing capacity \| £				300,000,000.0
Book value	421,300		421,300	331,800,000
Credit facility, outstanding amount	$ 444,500		$ 444,500	350,000,000.0	$ 445,837
Weighted average interest rate (as a percent)	3.75%	3.35%
Cabot securitisation senior facilities \| LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)			2.85%
Cabot Securitisation Non-Recourse Asset-Backed Senior Facility
Debt Instrument [Line Items]
Facility agreement, borrowing capacity \| $						$ 50,000
Book value	$ 66,900		$ 66,900	£ 52,700,000
Cabot Securitisation Non-Recourse Asset-Backed Senior Facility \| LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)			4.075%