Aggregate notional amount specified by the derivative(s). Expressed as an absolute 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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Derivative Instruments - Derivatives Not Designated as Hedging Instruments (Details) $ in Thousands		3 Months Ended	12 Months Ended
	Dec. 20, 2013 AUD ($) loan	Mar. 31, 2017 USD ($)	Dec. 31, 2017 USD ($) derivative_instrument	Dec. 31, 2017 EUR (€) derivative_instrument	Dec. 31, 2016 USD ($)	Jan. 31, 2014 AUD ($)	Dec. 31, 2010 USD ($) derivative_instrument
Derivative [Line Items]
Fair value of derivative assets			$ 48,186		$ 4,464
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		34,749
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			42,140		4,464
Included in issuance of Series A convertible redeemable Preferred Stock		$ 4,382
Unrealized gain on derivatives			33,294
Derivatives not designated as hedging instruments: \| Interest rate swaps
Derivative [Line Items]
Derivative liability, noncurrent			0		330
Derivative liability, current			179		0
Derivatives not designated as hedging instruments: \| Interest rate swaps \| THINK
Derivative [Line Items]
Derivative, notional amount						$ 22,500,000
Variable interest converted			17,375			$ 22,500,000
Derivative, fixed interest rate						3.86%
Derivative liability, noncurrent			$ 179		330
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) \| derivative_instrument			6	6
Derivative liability, current			$ 4,279
Derivatives not designated as hedging instruments: \| Cross currency and interest rate swaps
Derivative [Line Items]
Derivative liability, noncurrent			7,939		7,420
Derivative liability, current			4,279		0
Derivatives not designated as hedging instruments: \| Cross currency and interest rate swaps \| Chile
Derivative [Line Items]
Derivative, notional amount							$ 31,000
Derivative liability, noncurrent			$ 7,939		$ 7,420
Derivative, number of instruments held (derivative instrument) \| derivative_instrument							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) \| derivative_instrument							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) \| derivative_instrument							3