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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
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Cash Flow Hedge Derivative Instrument, Unamortized Balance

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- Definition

Gain (loss) on hedging derivative instrument or the foreign currency transaction gain (loss) on the nonderivative hedging instrument designated as a hedge of a net investment in foreign operations related to hedge ineffectiveness, which is included in earnings in the period.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
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- Definition

The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months.

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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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- Definition

Average cap rate on a group of foreign currency derivatives for example, but not limited to, caps or collars.

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The amount of cash received during the period on settlement of a hedge.

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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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- Definition

Fixed interest rate that will be received or paid upon exercise of the interest rate swaption contract.

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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 net gain (loss) recognized in earnings during the reporting period representing the amount of the cash flow hedges' ineffectiveness.

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Percentage derived by dividing the change in value of a hedging instrument by the change in the value of the hedged item.

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- Definition

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

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-Name Accounting Standards Codification
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Number of interest rate derivative instruments held by the entity at the reporting date.

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Amount after tax and reclassification adjustments, of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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Derivative Instruments - Derivatives Designated as Hedging Instruments Narrative (Details)		9 Months Ended	12 Months Ended
	Aug. 21, 2018 USD ($)	Sep. 30, 2018 USD ($)	Dec. 31, 2017 USD ($) derivative_instrument	Dec. 31, 2018 USD ($)	Dec. 31, 2017 EUR (€) derivative_instrument	May 31, 2017 USD ($) derivative_instrument
Derivatives, Fair Value [Line Items]
Fair value of derivative assets			$ 48,186,000	$ 3,259,000
Derivatives designated as hedging instruments: \| Interest rate swaps
Derivatives, Fair Value [Line Items]
Gain (loss) recognized in income on the ineffective portion of derivative instruments designated as cash flow hedging			0
Fair value of derivative assets			6,046,000	0
Cash Flow Hedge Derivative Instrument, Unamortized Balance				11,818,000
Derivatives designated as hedging instruments: \| Net investment cross currency swaps
Derivatives, Fair Value [Line Items]
Derivative liability, noncurrent			1,451,000	0
Derivatives designated as hedging instruments: \| Cross currency swaps
Derivatives, Fair Value [Line Items]
Fair value of derivative assets			0	$ 3,259,000
Derivatives designated as hedging instruments: \| Cash Flow Hedging
Derivatives, Fair Value [Line Items]
Derivative, Cash Received on Hedge	$ 14,117,000
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	$ 1,172,000
Derivatives designated as hedging instruments: \| Cash Flow Hedging \| Interest rate swaps
Derivatives, Fair Value [Line Items]
Number of interest rate derivatives held (derivative instrument) \| derivative_instrument						4
General Fair Value Hedge Information, Hedge Effectiveness Threshold		100.00%
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months		$ 4,900,000
Derivatives designated as hedging instruments: \| Cash Flow Hedging \| Interest Rate Swap, Instrument One
Derivatives, Fair Value [Line Items]
Derivative, notional amount						$ 100,000,000
Derivatives designated as hedging instruments: \| Cash Flow Hedging \| Interest Rate Swap, Instrument Two
Derivatives, Fair Value [Line Items]
Derivative, notional amount						100,000,000
Derivatives designated as hedging instruments: \| Cash Flow Hedging \| Interest Rate Swap, Instrument Three
Derivatives, Fair Value [Line Items]
Derivative, notional amount						200,000,000
Derivatives designated as hedging instruments: \| Cash Flow Hedging \| Interest Rate Swap, Instrument Four
Derivatives, Fair Value [Line Items]
Derivative, notional amount						$ 300,000,000
Derivatives designated as hedging instruments: \| Net Investment Hedging \| Net investment cross currency swaps
Derivatives, Fair Value [Line Items]
Gain or (loss) recognized in income on the ineffective portion of derivative instruments designated as hedging			$ 0
Number of currency derivatives held (derivative instrument) \| derivative_instrument			2		2
Derivatives designated as hedging instruments: \| Net Investment Hedging \| Cross Currency Interest Rate Contract, Instrument One
Derivatives, Fair Value [Line Items]
Derivative, notional amount			$ 59,210,000		€ 50,000,000
Implied exchange rate			1.1842		1.1842
Derivatives designated as hedging instruments: \| Net Investment Hedging \| Cross Currency Interest Rate Contract, Instrument One \| Euro Member Countries, Euro
Derivatives, Fair Value [Line Items]
Swaption interest rate			5.63%		5.63%
Derivatives designated as hedging instruments: \| Net Investment Hedging \| Cross Currency Interest Rate Contract, Instrument One \| United States of America, Dollars
Derivatives, Fair Value [Line Items]
Swaption interest rate			8.25%		8.25%
Derivatives designated as hedging instruments: \| Net Investment Hedging \| Cross Currency Interest Rate Contract, Instrument Two
Derivatives, Fair Value [Line Items]
Derivative, notional amount			$ 59,360,000		€ 50,000,000
Implied exchange rate			1.1872		1.1872
Derivatives designated as hedging instruments: \| Net Investment Hedging \| Cross Currency Interest Rate Contract, Instrument Two \| Euro Member Countries, Euro
Derivatives, Fair Value [Line Items]
Swaption interest rate			5.6675%		5.6675%
Derivatives designated as hedging instruments: \| Net Investment Hedging \| Cross Currency Interest Rate Contract, Instrument Two \| United States of America, Dollars
Derivatives, Fair Value [Line Items]
Swaption interest rate			8.25%		8.25%