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Derivative and Hedging - Narrative (Details) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2018 USD ($) counterparty | Dec. 31, 2017 USD ($) | May 31, 2016 USD ($) counterparty | Sep. 30, 2012 USD ($)
Derivative [Line Items] |  |  |  |
Number of counterparties | counterparty | 4 |  |  |
Not Designated as Hedging Instrument | Cash Flow Hedging |  |  |  |
Derivative [Line Items] |  |  |  |
Notional amount of interest rate swaps | $ 384,000,000 | $ 418,300,000 |  |
Interest Rate Swap, September 2012 | Not Designated as Hedging Instrument | Cash Flow Hedging |  |  |  |
Derivative [Line Items] |  |  |  |
Amount of notional principal interest rate swap |  |  |  | $ 174,600,000.0
Notional amount of interest rate swaps | 100,400,000 | 117,900,000 |  |
Interest Rate Swap, May 2016 | Not Designated as Hedging Instrument | Cash Flow Hedging |  |  |  |
Derivative [Line Items] |  |  |  |
Number of counterparties | counterparty |  |  | 3 |
Amount of notional principal interest rate swap |  |  | $ 256,600,000.0 |
Notional amount of interest rate swaps | $ 283,600,000 | $ 300,400,000 |  |
Percentage hedged | 50.00% |  |  |
Interest Expense | Interest rate swaps |  |  |  |
Derivative [Line Items] |  |  |  |
Reclassification of interest expense | $ 4,900,000 |  |  |

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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 Nominal or face amount used to calculate payments on the derivative asset. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5580258-113959 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959 + Details
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- Definition Amount, before tax, of reclassification of gain (loss) from accumulated other comprehensive income (AOCI) for derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e689-108580 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e637-108580 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -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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