Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

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Derivative, Variable Interest, Value

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Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled after one year or the normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

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Fixed interest rate related to the interest rate derivative.

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Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled after one year or the normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

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The number of derivative instruments of a particular group held by the entity.

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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.

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Number of foreign currency exchange rate derivatives held by the entity at the reporting date.

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The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period.

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Derivative Instruments - Derivatives Not Designated as Hedging Instruments (Details) $ in Thousands	Jan. 16, 2018 EUR (€)	Dec. 20, 2013 AUD ($) loan	Sep. 30, 2018 USD ($)	Apr. 23, 2018 USD ($)	Dec. 31, 2017 USD ($) swap	Dec. 31, 2017 EUR (€) swap	Jan. 31, 2014 AUD ($)	Dec. 31, 2010 USD ($) swap
Derivative [Line Items]
Fair value of derivative assets			$ 682		$ 48,186
Lines of credit \| Term Loan Two \| Syndicated Facility Agreement
Derivative [Line Items]
Borrowing under credit facility		$ 22,500,000
THINK \| Lines of credit \| Term Loan \| Syndicated Facility Agreement
Derivative [Line Items]
Borrowing under credit facility		$ 45,000,000	32,724
Number of term loans (loan) \| loan		2
Days to enter into interest rate swap (within)		45 days
Required percentage of term loan to be converted to fixed interest rate (at least)		50.00%
THINK \| Lines of credit \| Term Loan One \| Syndicated Facility Agreement
Derivative [Line Items]
Borrowing under credit facility		$ 22,500,000
Derivatives not designated as hedging instruments: \| Contingent redemption features - Series A Preferred Stock
Derivative [Line Items]
Fair value of derivative assets			0	$ 140,300	42,140
Probability of conversion				100.00%
Derivatives not designated as hedging instruments: \| Interest rate swaps \| THINK
Derivative [Line Items]
Derivative, notional amount							$ 22,500,000
Variable interest converted			16,362				$ 22,500,000
Derivative, fixed interest rate							3.86%
Derivative liability, noncurrent			35		$ 179
Derivatives not designated as hedging instruments: \| Foreign Exchange Forward
Derivative [Line Items]
Derivative, notional amount \| €						€ 200,000,000
Number of currency derivatives held (derivative instrument) \| swap					6	6
Unrealized gain (loss) on derivatives \| €	€ (9,960,000)
Derivatives not designated as hedging instruments: \| Cross currency and interest rate swaps
Derivative [Line Items]
Derivative liability, noncurrent			7,258		$ 7,939
Derivatives not designated as hedging instruments: \| Cross currency and interest rate swaps \| Chile
Derivative [Line Items]
Derivative, notional amount								$ 31,000
Derivative liability, noncurrent			$ 7,258		$ 7,939
Derivative, number of instruments held (derivative instrument) \| swap								4
Derivatives not designated as hedging instruments: \| Cross Currency Interest Rate Contract, Maturing December 1, 2024 \| Chile
Derivative [Line Items]
Derivative, number of instruments held (derivative instrument) \| swap								1
Derivatives not designated as hedging instruments: \| Cross Currency Interest Rate Contract, Maturing July 1, 2025 \| Chile
Derivative [Line Items]
Derivative, number of instruments held (derivative instrument) \| swap								3