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Derivative Financial Instruments - Fair Value of Derivatives (Details) - USD ($) $ in Thousands | 12 Months Ended |
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Dec. 31, 2018 | Dec. 31, 2017
Derivatives, Fair Value [Line Items] |  |
Document Fiscal Year Focus | 2018 |
Treasury Lock [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Inception Date | Dec. 06, 2018 |
Derivative, Maturity Date | Jun. 28, 2019 |
Derivative, Notional Amount | $ 250,000 |
Derivative, Underlying Basis | 30 year U.S. Treasury |
Derivative, Fixed Interest Rate | 3.14667% |
Interest Rate Cash Flow Hedge Asset at Fair Value | $ (5,491) | $ 0
Derivative @ 1.824% 300M [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Inception Date | Apr. 03, 2017 |
Derivative, Maturity Date | Dec. 02, 2020 |
Derivative, Notional Amount | $ 300,000 |
Derivative, Underlying Basis | 1 Month LIBOR with Floor |
Derivative, Fixed Interest Rate | 1.824% |
Interest Rate Cash Flow Hedge Asset at Fair Value | $ (3,759) | (1,804)
Derivative @ 1.053% 265M [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Inception Date | Aug. 01, 2016 |
Derivative, Maturity Date | Jan. 05, 2022 |
Derivative, Notional Amount | $ 265,000 |
Derivative, Underlying Basis | 1 Month LIBOR with Floor |
Derivative, Fixed Interest Rate | 1.053% |
Interest Rate Cash Flow Hedge Asset at Fair Value | $ (10,838) | (10,744)
Derivative @ 1.30250% 20.0M [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Inception Date | Apr. 07, 2016 |
Derivative, Maturity Date | Apr. 01, 2023 |
Derivative, Notional Amount | $ 20,000 |
Derivative, Underlying Basis | 1 Month LIBOR |
Derivative, Fixed Interest Rate | 1.3025% |
Interest Rate Cash Flow Hedge Asset at Fair Value | $ (880) | (801)
Derivative @ 1.490% 33.0M [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Inception Date | Dec. 01, 2016 |
Derivative, Maturity Date | Nov. 01, 2023 |
Derivative, Notional Amount | $ 33,000 |
Derivative, Underlying Basis | 1 Month LIBOR |
Derivative, Fixed Interest Rate | 1.49% |
Interest Rate Cash Flow Hedge Asset at Fair Value | $ (1,376) | (1,166)
Derivative @ 2.36600% 37.5K [Member] [Domain] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Inception Date | Jun. 02, 2017 |
Derivative, Maturity Date | Jun. 02, 2027 |
Derivative, Notional Amount | $ 37,500 |
Derivative, Underlying Basis | 1 Month LIBOR with Floor |
Derivative, Fixed Interest Rate | 2.366% |
Interest Rate Cash Flow Hedge Liability at Fair Value | $ 629 | 177
Fair Value, Measurements, Recurring [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Interest Rate Cash Flow Hedge Asset at Fair Value | (17,482) | (14,515)
Interest Rate Cash Flow Hedge Liability at Fair Value | 5,491 | 177
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Interest Rate Cash Flow Hedge Asset at Fair Value | (17,482) | (14,515)
Interest Rate Cash Flow Hedge Liability at Fair Value | 5,491 | 177
Interest Rate Cash Flow Hedge Derivative at Fair Value, Net | $ (11,991) | $ 14,338

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- Definition This is focus fiscal year of the document report in CCYY format. For a 2006 annual report, which may also provide financial information from prior periods, fiscal 2006 should be given as the fiscal year focus. Example: 2006. + References No definition available. + Details
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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 Reference to the index or unit of measurement for the underlying which establishes the pricing terms of the derivative instrument. For example, the basis on the underlying for a natural gas futures contract might be the NYMEX price per million British thermal units (MMBtu). + References No definition available. + Details
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- Definition Fair value as of the balance sheet date of all interest rate derivative assets designated as cash flow 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 4B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624163-113959 + Details
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