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Fair Value Measurements - Additional Information (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Derivatives Fair Value |  |  |
Loss to be reclassified during next 12 months | $ 200,000 |  |
Nonrecurring |  |  |
Derivatives Fair Value |  |  |
Assets and liabilities measured at FV on a non-recurring basis | 0 | $ 0 |
Interest rate swap | Interest Expense |  |  |
Derivatives Fair Value |  |  |
Ineffectiveness recorded in interest expense | $ 300,000 | 0 | $ 0
LIBOR | Interest rate swap |  |  |
Derivatives Fair Value |  |  |
Derivative interest rate | 1.00% |  |
Cash Flow Hedging | Designated as Hedging Instrument | Interest rate swap |  |  |
Derivatives Fair Value |  |  |
Derivative, average fixed interest rate | 2.151% |  |
Notional amounts of the forward contracts | $ 700,000,000 | $ 700,000,000 |

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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 Fair Value Measurements, Assets and Liabilities Measured on Non-Recurring Basis, Gain (Loss) + References No definition available. + Details
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- Definition Average fixed interest rate related to the group of interest rate derivatives. + References No definition available. + Details
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- Definition The amount of net gains or losses on interest rate cash flow hedges reclassified during the period to earnings from accumulated other comprehensive income upon the hedged transaction affecting earnings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 + Details
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- Definition The estimated net amount of unrealized gains or losses on interest rate cash flow hedges as of the balance sheet date expected to be reclassified to earnings within the next twelve months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80748-113994 + Details
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