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Derivative Instruments - Narrative (Details) MMBTU in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2020 USD ($) | Jun. 30, 2019 USD ($) | Jun. 30, 2020 USD ($) MMBTU | Jun. 30, 2019 USD ($) | Jun. 30, 2020 USD ($) MMBTU | Jun. 30, 2019 USD ($) | Dec. 31, 2019 USD ($) | Apr. 30, 2019 USD ($)
Derivative [Line Items] |  |  |  |  |  |  |  |
Change in unrealized gain (loss) on hedged item |  |  |  |  | $ (14,237,000) | $ 0 |  |
Cash Received (Paid) in Settlement of Commodity Derivative Instruments: |  |  | $ 142,256,000 | $ 10,672,000 | 293,417,000 | (30,710,000) |  |
Interest Rate Swap |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Derivative notional amount |  |  | 581,218,000 |  | 581,218,000 |  | $ 160,000,000 |
Interest Rate Swap | Interest Expense |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Cash (paid) received on settlement of derivatives |  |  | (536,000) |  | (592,000) |  |  |
Change in unrealized gain (loss) on hedged item |  |  | (3,598,000) |  | (14,237,000) |  |  |
Gain (loss) on derivative, net |  |  | (4,134,000) |  | (14,829,000) |  |  |
Interest Rate Swap on Revolving Credit Facility | Long |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Term of derivative contract | 4 years |  |  |  |  |  |  |
Put option | 0.00% |  |  |  |  |  |  |
Derivative notional amount | $ 250,000,000 |  | $ 250,000,000 |  | $ 250,000,000 |  |  |
Interest Rate Swap On Line Of Credit | Long |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Put option |  |  | 0.25% |  | 0.25% |  |  |
NYMEX Natural Gas Hedges | Natural Gas |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Cash Received (Paid) in Settlement of Commodity Derivative Instruments: |  |  | $ 29,015,000 |  |  |  |  |
Nonmonetary notional amount | MMBTU |  |  | 39 |  | 39 |  |  |
NYMEX Commodity Swaps | Natural Gas |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Cash Received (Paid) in Settlement of Commodity Derivative Instruments: |  |  |  |  | $ 54,982,000 |  |  |
Line of Credit |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Credit facility, face amount | $ 175,000,000 |  |  |  |  |  |  |
Revolving Credit Facility |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Credit facility, face amount |  | $ 160,000,000 |  | $ 160,000,000 |  | $ 160,000,000 |  | $ 2,100,000,000
Credit facility, modification period |  | 3 years |  |  |  |  |  |

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