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

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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
	Jan. 16, 2018 EUR (€)	Dec. 20, 2013 AUD ($) loan	Mar. 31, 2018 USD ($)	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			$ 41,341	$ 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	34,655
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			28,608	42,140
Unrealized gain (loss) on derivatives			(13,533)
Derivatives not designated as hedging instruments: \| Interest rate swaps \| THINK
Derivative [Line Items]
Derivative, notional amount						$ 22,500,000
Variable interest converted				17,327		$ 22,500,000
Derivative, fixed interest rate						3.86%
Derivative liability, noncurrent			123	$ 179
Derivatives not designated as hedging instruments: \| Foreign Exchange Forward
Derivative [Line Items]
Unrealized gain (loss) on derivatives \| €	€ (9,960,000)
Derivative, notional amount \| €					€ 200,000,000
Number of currency derivatives held (derivative instrument) \| swap				6	6
Derivatives not designated as hedging instruments: \| Cross currency and interest rate swaps
Derivative [Line Items]
Derivative liability, noncurrent			8,130	$ 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			$ 8,130	$ 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