The amount of cash outflow on termination of lease before expiration of lease term.

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Represents the percentage of securities in foreign subsidiaries unconditionally guaranteed to secure the debt instrument.

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The amount of structured project finance arragngements that must be secured in order to avoid additional fees.

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Face (par) amount of debt instrument at time of issuance.

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Amount of the fee that accompanies borrowing money under the debt instrument.

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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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.

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The designation of funds furnished by a borrower to a lender to assure future payments of the borrower's real estate taxes and insurance obligations with respect to a mortgaged property. Escrow deposits may be made for a variety of other purposes such as earnest money and contingent payments. This element excludes replacement reserves which are an escrow separately provided for within the US GAAP taxonomy.

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the remainder of the fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

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Cash inflow associated with loan origination (the process when securing a mortgage for a piece of real property) or lease origination.

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The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

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Long-Term Debt (Details) - USD ($) $ in Thousands		1 Months Ended		3 Months Ended
Long-Term Debt (Details) - USD ($) $ in Thousands	Jul. 21, 2017	Apr. 30, 2019	Mar. 31, 2019	Mar. 31, 2019
Long-Term Debt
Borrowing				$ 84,761
Repayments of long-term debt and accrued interest				53,534
Minimum structured finance arrangements			$ 50,000	50,000
Percent of securities in foreign subsidiaries guaranteed to secure debt			65.00%
Principal payments of long term debt
December 31, 2019			$ 79,638	79,638
December 31, 2020			58,034	58,034
December 31, 2021			36,106	36,106
Maximum
Long-Term Debt
Additional fees			$ 1,500	$ 1,500
Secured term loan facility
Long-Term Debt
Effective interest rate (as a percent)			12.00%	12.00%
Term of loan agreement			3 years
NY Green Bank
Long-Term Debt
Loss on extinguishment of debt				$ 500
Cash held in escrow deposit			$ 1,700	1,700
Long-term borrowings			85,000	85,000
Collective loan proceeds			32,100
Loan and security agreement \| Generate Lending, LLC
Long-Term Debt
Repayments of long-term debt and accrued interest	$ 17,600			17,600
Termination of certain equipment leases	$ 50,300			50,300
Loan and security agreement \| Generate Lending, LLC \| Secured term loan facility
Long-Term Debt
Loan Amount			$ 100,000	100,000
Borrowing		$ 15,000		$ 85,000
Loan and security agreement \| Generate Lending, LLC \| Subsequent event \| Secured term loan facility
Long-Term Debt
Borrowing		$ 15,000