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Derivative Instruments - Derivative Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Sep. 19, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Derivative [Line Items] |  |  |  |  |  |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax |  |  |  |  |  | $ 1,900 |
Interest Rate Swap [Member] | Senior Secured Term Loan A [Member] | Cash Flow Hedging [Member] |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Derivative, Maturity Date |  |  |  | Jun. 30, 2020 |  |  |
Cash paid at termination of interest rate swap |  |  | $ 4,700 |  |  |  |
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net |  |  | (2,900) |  |  |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax |  |  | $ (1,800) |  |  |  |
Designated as Hedging Instrument [Member] | Cross Currency Interest Rate Contract [Member] | Net Investment Hedging [Member] |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Derivative, Cash Received on Hedge | $ 1,100 |  |  |  |  |  |
Maximum Remaining Maturity of Foreign Currency Derivatives | 5 years | 5 years |  |  |  |  |
Derivative, Fixed Interest Rate | 2.90% | 2.10% |  |  | 2.90% | 2.10% |
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net |  |  |  |  | $ 0 | $ 0 | $ 0
Maximum [Member] | Interest Rate Swap [Member] | Senior Secured Term Loan A [Member] | Cash Flow Hedging [Member] |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Derivative, Notional Amount |  |  |  | $ 238,400 |  |  |
Maximum [Member] | Interest Rate Swap [Member] | Senior Secured Term Loan A [Member] | Cash Flow Hedging [Member] | Derivative, June 2020 Maturity [Member] |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Derivative, Fixed Interest Rate |  |  |  | 2.68% |  |  |
Maximum [Member] | Designated as Hedging Instrument [Member] | Cross Currency Interest Rate Contract [Member] | Net Investment Hedging [Member] |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Derivative, Notional Amount | $ 125,000 | $ 150,000 |  |  | 125,000 | 150,000 |
Minimum [Member] | Interest Rate Swap [Member] | Senior Secured Term Loan A [Member] | Cash Flow Hedging [Member] |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Derivative, Fixed Interest Rate |  |  |  | 0.74% |  |  |
Minimum [Member] | Interest Rate Swap [Member] | Senior Secured Term Loan A [Member] | Cash Flow Hedging [Member] | Derivative, June 2020 Maturity [Member] |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Derivative, Notional Amount |  |  |  | $ 192,700 |  |  |
Minimum [Member] | Designated as Hedging Instrument [Member] | Cross Currency Interest Rate Contract [Member] | Net Investment Hedging [Member] |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Derivative, Notional Amount | $ 75,000 | $ 75,000 |  |  | $ 75,000 | $ 75,000 |

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References 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 + Details
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- Definition Cash paid at termination of interest rate swap + References No definition available. + Details
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- Definition The amount of cash received during the period on settlement of a hedge. + References No definition available. + Details
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- Definition Fixed interest rate related to the interest rate derivative. + References No definition available. + Details
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- Definition The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4D -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624177-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959 + Details
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- Definition 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. + References No definition available. + Details
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- Definition Date the derivative contract matures, in CCYY-MM-DD format. + References No definition available. + Details
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- Definition Maximum amount of time remaining before foreign currency exchange rate derivatives mature or expire, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Amount of tax expense (benefit) of reclassification adjustment from accumulated other comprehensive income of accumulated gain (loss) realized from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's deferred hedging gain (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e640-108580 + Details
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