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Derivatives - Additional Information (Details) - USD ($) $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2017 | Sep. 30, 2015 | Jan. 31, 2014
Derivative [Line Items] |  |  |  |  |  |
Settlement Gain on Derivative Instruments | $ 0 | $ 1,896 | $ 0 |  |  |
2018 Treasury Locks |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Debt instrument, LIBOR Rate | ten year U.S. Treasury |  |  |  |  |
Swaps, Number of Instruments Held | 2 |  |  |  |  |
Swaps, Notional Amount | $ 100,000 |  |  |  |  |
Swaps, Average Fixed Interest Rate | 2.93% |  |  |  |  |
2014 Swaps |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Debt instrument, LIBOR Rate | one month LIBOR |  |  |  |  |
Swaps, Number of Instruments Held |  |  |  |  |  | 4
Swaps, Notional Amount |  |  |  |  |  | $ 200,000
Swaps, Average Fixed Interest Rate |  |  |  |  |  | 2.29%
2015 Swaps |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Debt instrument, LIBOR Rate | one month LIBOR |  |  |  |  |
Swaps, Number of Instruments Held |  |  |  |  | 6 |
Swaps, Notional Amount |  |  |  |  | $ 260,000 |
Swaps, Average Fixed Interest Rate |  |  |  |  | 1.79% |
2017 Treasury Locks |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Debt instrument, LIBOR Rate |  | ten year U.S. Treasury |  |  |  |
Swaps, Number of Instruments Held |  |  |  | 2 |  |
Swaps, Notional Amount |  |  |  | $ 100,000 |  |
Swaps, Average Fixed Interest Rate |  |  |  | 2.18% |  |
Settlement Gain on Derivative Instruments |  | $ 1,896 |  |  |  |

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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 The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR. + 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 Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4CC -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL109998890-113959 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 (e) -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 The number of derivative instruments of a particular group held by the entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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