Derivative Instrument, Period of Option to Prepay Using Proceeds from Equity Offering

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- Definition

Derivative Instruments, Percentage of Option to Prepay in Equity Offerings

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- Definition

Derivative Instruments, Percentage of Option to Prepay Principal Amount

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- Definition

Derivative Instruments, Percentage of Principal Amount Outstanding

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

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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Face (par) amount of debt instrument at time of issuance.

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Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

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- Definition

Fair value of liability associated with 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.

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Fair value, before 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. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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The portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness.

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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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Fair value as of the balance sheet date of the embedded derivative or group of embedded derivatives classified as a liability.

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Net Increase or Decrease in the fair value of the embedded derivative or group of embedded derivatives included in earnings in the period.

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Amount of tax expense (benefit), after 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), attributable to parent entity.

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Amount after tax 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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Derivatives and Hedging Activities (Details) - USD ($)	3 Months Ended		6 Months Ended
Derivatives and Hedging Activities (Details) - USD ($)	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017	Aug. 09, 2016
Derivative [Line Items]
Net of tax effect on unrealized loss on derivatives	$ 400,000	$ (600,000)	$ 1,000,000	$ (900,000)
Percentage of option to prepay in equity offerings (up to)			40.00%
Period of option to prepay using proceeds from equity offering			180 days
Percentage of principal amount outstanding			50.00%
Redemption price percentage			108.25%
Fair value of embedded derivative liability	0		$ 0		$ 0
Other Operating Income (Expense)
Derivative [Line Items]
Change in fair value in amount included as other income (expense)	0	0	0	13,200,000
Designated as Hedging Instrument \| Foreign Exchange Contract
Derivative [Line Items]
Notional foreign exchange contract outstanding	88,000,000		88,000,000		88,000,000
Gain (loss) related to related to the ineffective portion of the net investment hedge	1,100,000	(900,000)	2,300,000	(1,400,000)
Net of tax effect on unrealized loss on derivatives	400,000	(600,000)	1,000,000	(900,000)
Designated as Hedging Instrument \| Foreign Exchange Contract \| Other Noncurrent Assets
Derivative [Line Items]
Fair value asset of derivative instrument	1,000,000		1,000,000
Designated as Hedging Instrument \| Foreign Exchange Contract \| Other Noncurrent Liabilities
Derivative [Line Items]
Fair value liability of derivative instrument					$ 2,400,000
Designated as Hedging Instrument \| Foreign Exchange Contract \| Other Operating Income (Expense)
Derivative [Line Items]
Gain (loss) related to related to the ineffective portion of the net investment hedge	60,000,000,000		135,000,000,000
Ineffective portion of loss		$ 64,000		$ 95,000
Senior Notes \| Senior Secured Notes Due 2021
Derivative [Line Items]
Principal amount of debt	$ 575,000,000.0		$ 575,000,000.0			$ 575,000,000.0
Percentage of option to prepay principal amount (equal to)			100.00%