Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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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.

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The number of derivative instruments of a particular group held by the entity.

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Derivatives - Summary of Derivative Instruments (Details) $ in Thousands	Mar. 31, 2019 USD ($) Instrument	Dec. 31, 2018 USD ($)	Mar. 31, 2018 USD ($)
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative asset, fair market value		$ 6,958	$ 590
Interest rate swaps
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amount	$ 1,416,025
Derivative asset, fair market value	$ (27,724)
Interest rate swaps \| Interest rate swap, 9/20/2020
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Quantity \| Instrument	1
Hedge interest rates	2.69%
Notional amount	$ 80,500
Derivative asset, fair market value	$ (437)
Interest rate swaps \| Interest rate swap, 8/31/2022
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Quantity \| Instrument	1
Notional amount	$ 13,179
Derivative asset, fair market value	$ 314
Interest rate swaps \| Interest rate swap, 8/31/2022 \| Minimum
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedge interest rates	1.27%
Interest rate swaps \| Interest rate swap, 8/31/2022 \| Maximum
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedge interest rates	1.29%
Interest rate swaps \| Interest rate swap, 4/30/2024 - 10/31/2024
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Quantity \| Instrument	8
Notional amount	$ 283,160
Derivative asset, fair market value	$ (384)
Interest rate swaps \| Interest rate swap, 4/30/2024 - 10/31/2024 \| Minimum
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedge interest rates	2.16%
Interest rate swaps \| Interest rate swap, 4/30/2024 - 10/31/2024 \| Maximum
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedge interest rates	2.39%
Interest rate swaps \| Interest rate swap, 10/30/2026 - 10/31/2026
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Quantity \| Instrument	3
Notional amount	$ 102,720
Derivative asset, fair market value	$ (3,631)
Interest rate swaps \| Interest rate swap, 10/30/2026 - 10/31/2026 \| Minimum
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedge interest rates	2.89%
Interest rate swaps \| Interest rate swap, 10/30/2026 - 10/31/2026 \| Maximum
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedge interest rates	3.08%
Interest rate swaps \| Interest rate swap, 9/20/2027
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Quantity \| Instrument	1
Hedge interest rates	2.97%
Notional amount	$ 30,023
Derivative asset, fair market value	$ (1,011)
Interest rate swaps \| Interest rate swap, 3/20/2030 - 6/20/2030
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Quantity \| Instrument	2
Notional amount	$ 160,401
Derivative asset, fair market value	$ 1,177
Interest rate swaps \| Interest rate swap, 3/20/2030 - 6/20/2030 \| Minimum
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedge interest rates	2.22%
Interest rate swaps \| Interest rate swap, 3/20/2030 - 6/20/2030 \| Maximum
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedge interest rates	2.57%
Interest rate swaps \| Interest rate swap, 1/20/2031
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Quantity \| Instrument	1
Hedge interest rates	2.61%
Notional amount	$ 9,899
Derivative asset, fair market value	$ (332)
Interest rate swaps \| Interest rate swap, 4/30/3034
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Quantity \| Instrument	3
Hedge interest rates	2.78%
Notional amount	$ 200,000
Derivative asset, fair market value	$ (6,545)
Interest rate swaps \| Interest rate swap, 7/31/2035
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Quantity \| Instrument	5
Notional amount	$ 151,610
Derivative asset, fair market value	$ (2,197)
Interest rate swaps \| Interest rate swap, 7/31/2035 \| Minimum
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedge interest rates	2.56%
Interest rate swaps \| Interest rate swap, 7/31/2035 \| Maximum
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedge interest rates	2.95%
Interest rate swaps \| Interest rate swap, 10/31/2036
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Quantity \| Instrument	5
Notional amount	$ 183,398
Derivative asset, fair market value	$ (2,710)
Interest rate swaps \| Interest rate swap, 10/31/2036 \| Minimum
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedge interest rates	2.62%
Interest rate swaps \| Interest rate swap, 10/31/2036 \| Maximum
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedge interest rates	2.95%
Interest rate swaps \| Interest rate swap, 4/30/2037
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Quantity \| Instrument	3
Notional amount	$ 100,000
Derivative asset, fair market value	$ (7,099)
Interest rate swaps \| Interest rate swap, 4/30/2037 \| Minimum
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedge interest rates	3.28%
Interest rate swaps \| Interest rate swap, 4/30/2037 \| Maximum
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedge interest rates	3.30%