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Derivative Instruments and Hedging Activity (Details) - USD ($) $ in Thousands | 1 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
May 31, 2019 | Dec. 31, 2018 | Sep. 30, 2017 | Jul. 31, 2014 | Sep. 30, 2013 | Sep. 30, 2019 | Dec. 31, 2018 | Jun. 30, 2019 | Mar. 31, 2019
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Realized gain (loss) on settlement of interest rate swaps |  |  |  |  |  | $ 802 |  |  |
Derivative, Net Liability Position, Aggregate Fair Value |  |  |  |  |  | 14,300 |  |  |
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred |  |  |  |  |  | (1,300) |  |  |
Interest Rate Swap Agreement One [Member] |  |  |  |  |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Derivative, Notional Amount |  |  |  |  | $ 35,000 |  |  |  |
Derivative, Inception Date |  |  |  |  | Oct. 03, 2013 |  |  |  |
Derivative, Maturity Date |  |  |  |  | Sep. 29, 2020 |  |  |  |
Description of Interest Rate Cash Flow Hedge Activities |  |  |  |  | the Company receives from the counterparty interest on the notional amount based on one month LIBOR and pays to the counterparty a fixed rate of 2.20%. |  |  |  |
Fixed interest rate |  |  |  |  | 2.20% |  |  |  |
Derivative, Amount of Hedged Item |  |  |  |  | $ 35,000 |  |  |  |
Fair Value, Net Asset (Liability) |  |  |  |  |  | (200) |  |  |
Interest Rate Swap Agreement Two [Member] |  |  |  |  |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Derivative, Notional Amount |  |  |  | $ 65,000 |  |  |  |  |
Derivative, Inception Date |  |  |  | Jul. 21, 2014 |  |  |  |  |
Derivative, Maturity Date |  |  |  | Jul. 21, 2021 |  |  |  |  |
Description of Interest Rate Cash Flow Hedge Activities |  |  |  | the Company receives from the counterparty interest on the notional amount based on one month LIBOR and pays to the counterparty a fixed rate of 2.09%. |  |  |  |  |
Fixed interest rate |  |  |  | 2.09% |  |  |  |  |
Derivative, Amount of Hedged Item |  |  |  | $ 65,000 |  |  |  |  |
Fair Value, Net Asset (Liability) |  |  |  |  |  | (700) |  |  |
Interest Rate Swap Agreement Three [Member] |  |  |  |  |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Derivative, Notional Amount |  |  | $ 40,000 |  |  |  |  |  |
Derivative, Inception Date |  |  | Aug. 01, 2016 |  |  |  |  |  |
Derivative, Maturity Date |  |  | Jul. 01, 2023 |  |  |  |  |  |
Description of Interest Rate Cash Flow Hedge Activities |  |  | the Company receives from the counterparty interest on the notional amount based on one month LIBOR and pays to the counterparty a fixed rate of 1.40%. |  |  |  |  |  |
Fixed interest rate |  |  | 1.40% |  |  |  |  |  |
Derivative, Amount of Hedged Item |  |  | $ 40,000 |  |  |  |  |  |
Fair Value, Net Asset (Liability) |  |  |  |  |  | 0 |  |  |
Interest Rate Swap Agreement Four [Member] |  |  |  |  |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Derivative, Notional Amount |  | $ 100,000 |  |  |  |  | $ 100,000 |  |
Derivative, Inception Date |  | Dec. 27, 2018 |  |  |  |  |  |  |
Derivative, Maturity Date |  | Jan. 15, 2026 |  |  |  |  |  |  |
Description of Interest Rate Cash Flow Hedge Activities |  |  |  |  |  |  | the Company receives from the counterparty interest on the notional amount based on one month LIBOR and pays to the counterparty a fixed rate of 2.66% |  |
Fixed interest rate |  | 2.66% |  |  |  |  | 2.66% |  |
Derivative, Amount of Hedged Item |  | $ 100,000 |  |  |  |  | $ 100,000 |  |
Fair Value, Net Asset (Liability) |  |  |  |  |  | (7,600) |  |  |
Interest Rate Swap Agreement Five [Member] |  |  |  |  |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Derivative, Notional Amount |  |  |  |  |  |  |  |  | $ 100,000
Realized gain (loss) on settlement of interest rate swaps | $ 800 |  |  |  |  |  |  |  |
Interest Rate Swap Agreement Six [Member] |  |  |  |  |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Derivative, Notional Amount |  |  |  |  |  |  |  | $ 100,000 |
Fair Value, Net Asset (Liability) |  |  |  |  |  | $ (5,500) |  |  |

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