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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
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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 within one year or 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 premium (cost) of a hedge, expensed during the period.

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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 within one year or normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

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

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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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-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
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Derivative Instruments - Derivatives Not Designated as Hedging Instruments (Details) $ in Thousands			3 Months Ended
	Apr. 02, 2019 USD ($)	Jan. 16, 2018 EUR (€)	Mar. 31, 2019 USD ($)	Apr. 30, 2019 USD ($) swap $ / €	Apr. 30, 2019 EUR (€) swap $ / €	Dec. 31, 2018 USD ($) swap $ / €	Dec. 31, 2018 EUR (€) swap $ / €	Apr. 23, 2018 USD ($)	Dec. 31, 2017 EUR (€) swap	Dec. 31, 2010 USD ($) swap
Derivative [Line Items]
Fair value of derivative assets			$ 6,197			$ 3,259
Derivatives not designated as hedging instruments: \| Contingent redemption features - Series A Preferred Stock
Derivative [Line Items]
Fair value of derivative assets								$ 140,300
Probability of conversion								100.00%
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						2	2		6
Unrealized gain (loss) on derivatives \| €		€ (9,960,000)
Derivatives not designated as hedging instruments: \| Cross currency swaps
Derivative [Line Items]
Derivative liability, noncurrent			0			$ 6,656
Current derivative liability			1,223			4,021
Current derivative asset			3,777			0
Derivatives not designated as hedging instruments: \| Cross currency swaps \| Europe
Derivative [Line Items]
Derivative, notional amount \| €							€ 275,000,000
Derivatives not designated as hedging instruments: \| Cross currency swaps \| Chile
Derivative [Line Items]
Derivative, notional amount										$ 31,000
Derivative liability, noncurrent						6,656
Derivative, number of instruments held (derivative instrument) \| swap										4
Payment on settlement of derivative			$ 8,200
Derivatives not designated as hedging instruments: \| Cross Currency Interest Rate Contract, Maturing April 8, 2019 \| Europe
Derivative [Line Items]
Derivative, notional amount						$ 310,750	€ 275,000,000
Derivative, exchange rate \| $ / €						1.13	1.13
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
Minimum \| Derivatives not designated as hedging instruments: \| Cross currency swaps \| Europe
Derivative [Line Items]
Derivative, exchange rate \| $ / €						1.13355	1.13355
Maximum \| Derivatives not designated as hedging instruments: \| Cross currency swaps \| Europe
Derivative [Line Items]
Derivative, exchange rate \| $ / €						1.1439	1.1439
Subsequent Event \| Derivatives not designated as hedging instruments: \| Foreign Exchange Forward
Derivative [Line Items]
Number of currency derivatives held (derivative instrument) \| swap				7	7
Subsequent Event \| Derivatives not designated as hedging instruments: \| Cross currency swaps \| Europe
Derivative [Line Items]
Derivative, notional amount				$ 423,003	€ 375,000,000
Subsequent Event \| Derivatives not designated as hedging instruments: \| Cross Currency Interest Rate Contract, Maturing April 8, 2019 \| Europe
Derivative [Line Items]
Payment on settlement of derivative	$ 980
Derivative, exchange rate \| $ / €				1.128007	1.128007