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Derivative Instruments and Hedging Activity (Tables) | 6 Months Ended
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Jun. 30, 2020
Derivative Instruments and Hedging Activity |
Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block] | The Company had the following outstanding interest rate derivatives that were designated as cash flow hedges of interest rate risk (in thousands, except number of instruments): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Number of Instruments | ​ | Notional
​ | ​ | June 30, | ​ | December 31, | ​ | June 30, | ​ | December 31,
Interest Rate Derivatives |  | 2020 |  | 2019 |  | 2020 |  | 2019
Interest Rate Swap |  | 18 |  | 15 | ​ | $ | 240,000 | ​ | $ | 240,000
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] | The table below presents the estimated fair value of the Company’s derivative financial instruments, as well as their classification in the condensed consolidated balance sheets (in thousands). ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Asset Derivatives
​ | ​ | June 30, 2020 | ​ | December 31, 2019
​ |  | Fair Value |  | Fair Value
Derivatives designated as cash flow hedges: |  | ​ |  |  | ​ |
Interest Rate Swaps | ​ | $ | — | ​ | $ | 572
​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Liability Derivatives
​ | ​ | June 30, 2020 | ​ | December 31, 2019
​ |  | Fair Value |  | Fair Value
Derivatives designated as cash flow hedges: |  | ​ |  |  | ​ |
Interest Rate Swaps | ​ | $ | 42,641 | ​ | $ | 7,943
Schedule of Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Loss) [Table Text Block] | The table below displays the effect of the Company’s derivative financial instruments in the condensed consolidated statements of income and comprehensive income for the three and six months ended June 30, 2020 and 2019 (in thousands). ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Location of | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Derivatives in | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Income/(Loss) | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Cash Flow | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Reclassified from | ​ | Amount of Income/(Loss)
​ | ​ | Hedging | ​ | Amount of Income/(Loss) Recognized | ​ | Accumulated OCI | ​ | Reclassified from
​ | ​ | Relationships | ​ | in OCI on Derivative | ​ | into Income | ​ | Accumulated OCI into Expense
Three Months Ended June 30, |  | ​ |  | 2020 |  | 2019 |  | ​ |  | 2020 |  | 2019
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Interest rate swaps | ​ | $ | (3,289) | ​ | $ | (3,640) |  | Interest Expense | ​ | $ | 1,028 | ​ | $ | 157
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Six Months Ended June 30, |  | ​ |  | 2020 |  | 2019 |  | ​ |  | 2020 |  | 2019
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Interest rate swaps | ​ | $ | (36,667) | ​ | $ | (7,199) | ​ | Interest Expense | ​ | $ | 1,365 | ​ | $ | 344
​
Offsetting Assets And Liabilities [Table Text Block] | The table below presents a gross presentation of the effects of offsetting and a net presentation of the Company’s derivatives as of June 30, 2020 and December 31, 2019. The gross amounts of derivative assets or liabilities can be reconciled to the Tabular Disclosure of Fair Values of Derivative Instruments above, which also provides the location that derivative assets and liabilities are presented on the condensed consolidated balance sheets (in thousands): Offsetting of Derivative Assets as of June 30, 2020 ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Gross Amounts |  | Net Amounts of | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Offset in the | ​ | Assets presented | ​ | Gross Amounts Not Offset in the
​ | ​ | Gross Amounts |  | Statement of | ​ | in the Statement | ​ | Statement of Financial Position
​ | ​ | of Recognized | ​ | Financial | ​ | of Financial |  | Financial |  | Cash Collateral | ​ | ​ | ​
​ |  | Assets |  | Position |  | Position |  | Instruments |  | Received |  | Net Amount
Derivatives | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | —
​ Offsetting of Derivative Liabilities as of June 30, 2020 ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Net Amounts of | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ |  | Gross Amounts |  | Liabilities | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ |  | Offset in the |  | presented in the |  | Gross Amounts Not Offset in the
​ |  | Gross Amounts |  | Statement of |  | Statement of |  | Statement of Financial Position
​ |  | of Recognized |  | Financial |  | Financial |  | Financial |  | Cash Collateral | ​ | ​ | ​
​ |  | Liabilities |  | Position |  | Position |  | Instruments |  | Posted |  | Net Amount
Derivatives | ​ | $ | 42,641 | ​ | $ | — | ​ | $ | 42,641 | ​ | $ | — | ​ | $ | — | ​ | $ | 42,641
​ Offsetting of Derivative Assets as of December 31, 2019 ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Gross Amounts | ​ | Net Amounts of | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ |  | Offset in the |  | Assets presented |  | Gross Amounts Not Offset in the
​ |  | Gross Amounts |  | Statement of |  | in the Statement |  | Statement of Financial Position
​ |  | of Recognized |  | Financial |  | of Financial |  | Financial |  | Cash Collateral | ​ | ​ | ​
​ |  | Assets |  | Position |  | Position |  | Instruments |  | Received |  | Net Amount
Derivatives | ​ | $ | 572 | ​ | $ | — | ​ | $ | 572 | ​ | $ | (572) | ​ | $ | — | ​ | $ | —
​ Offsetting of Derivative Liabilities as of December 31, 2019 ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Net Amounts of | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ |  | Gross Amounts |  | Liabilities | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ |  | Offset in the |  | presented in the |  | Gross Amounts Not Offset in the
​ |  | Gross Amounts |  | Statement of |  | Statement of |  | Statement of Financial Position
​ |  | of Recognized |  | Financial |  | Financial |  | Financial |  | Cash Collateral | ​ | ​ | ​
​ |  | Liabilities |  | Position |  | Position |  | Instruments |  | Posted |  | Net Amount
Derivatives | ​ | $ | 7,943 | ​ | $ | — | ​ | $ | 7,943 | ​ | $ | (572) | ​ | $ | — | ​ | $ | 7,372

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