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Derivative Instruments and Hedging Activities - Summary of Active Derivative Instruments (Details) |  | 12 Months Ended
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Dec. 31, 2018 USD ($) $ / MMBTU | Dec. 31, 2018 USD ($) MMBTU $ / MMBTU
Commodity Contract - April 2019 | Not Designated as Hedging Instrument |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Derivative, term of contract | 1 year |
Derivative, active commodity swap, fixed price (in usd per MMBtu) | $ / MMBTU | 2.84 | 2.84
Initial notional amount, volume (in MMBtu) | MMBTU |  | 323,390
Interest Rate Swap October 2029 | Designated as Hedging Instrument |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Initial Notional Amount ($) | $ 9,200,000 | $ 9,200,000
Derivative, active interest rate swap | 5.77% | 5.77%
Derivative, term of contract | 11 years |
Interest Rate Swap June 2033 | Designated as Hedging Instrument |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Initial Notional Amount ($) | $ 10,000,000 | $ 10,000,000
Derivative, active interest rate swap | 3.19% | 3.19%
Derivative, term of contract | 15 years |
Interest Rate Swap - December 2020 | Not Designated as Hedging Instrument |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Initial Notional Amount ($) | $ 17,100,000 | $ 17,100,000
Derivative, active interest rate swap | 2.46% | 2.46%
Derivative, term of contract | 3 years |
Interest Rate Swap - December 2027 | Designated as Hedging Instrument |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Initial Notional Amount ($) | $ 14,100,000 | $ 14,100,000
Derivative, active interest rate swap | 4.74% | 4.74%
Derivative, term of contract | 10 years |
Interest Rate Swap - December 2038 | Designated as Hedging Instrument |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Initial Notional Amount ($) | $ 14,084,000 | $ 14,084,000
Derivative, active interest rate swap | 3.26% | 3.26%
Derivative, term of contract | 15 years |
Interest Rate Swap - February 2023 | Designated as Hedging Instrument |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Initial Notional Amount ($) | $ 20,746,000 | $ 20,746,000
Derivative, active interest rate swap | 2.19% | 2.19%
Derivative, term of contract | 7 years |
Interest Rate Swap - June 2028 - Contract 1 | Designated as Hedging Instrument |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Initial Notional Amount ($) | $ 14,643,000 | $ 14,643,000
Derivative, active interest rate swap | 3.70% | 3.70%
Derivative, term of contract | 8 years |
Interest Rate Swap - June 2028 - Contract 2 | Designated as Hedging Instrument |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Initial Notional Amount ($) | $ 10,734,000 | $ 10,734,000
Derivative, active interest rate swap | 3.70% | 3.70%
Derivative, term of contract | 8 years |
Interest Rate Swap - March 2020 - Contract 1 | Designated as Hedging Instrument |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Initial Notional Amount ($) | $ 9,665,000 | $ 9,665,000
Derivative, active interest rate swap | 1.71% | 1.71%
Derivative, term of contract | 8 years |
Interest Rate Swap - March 2020 - Contract 2 | Designated as Hedging Instrument |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Initial Notional Amount ($) | $ 7,085,000 | $ 7,085,000
Derivative, active interest rate swap | 1.71% | 1.71%
Derivative, term of contract | 8 years |
Interest Rate Swap - February 2021 | Designated as Hedging Instrument |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Initial Notional Amount ($) | $ 3,256,000 | $ 3,256,000
Derivative, active interest rate swap | 5.30% | 5.30%
Derivative, term of contract | 15 years |
Interest Rate Swap - March 2024 | Designated as Hedging Instrument |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Initial Notional Amount ($) | $ 13,081,000 | $ 13,081,000
Derivative, active interest rate swap | 5.40% | 5.40%
Derivative, term of contract | 15 years 6 months |
Commodity Contract - April 2020 | Not Designated as Hedging Instrument |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Derivative, active commodity swap, fixed price (in usd per MMBtu) | $ / MMBTU | 2.68 | 2.68
Initial notional amount, volume (in MMBtu) | MMBTU |  | 437,004
Commodity Contract - April 2021 | Not Designated as Hedging Instrument |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Derivative, active commodity swap, fixed price (in usd per MMBtu) | $ / MMBTU | 2.70 | 2.70
Initial notional amount, volume (in MMBtu) | MMBTU |  | 435,810
Other liabilities | Hybrid Instrument |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Fair Value ($) | $ 1,808,000 | $ 1,808,000

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