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Derivative Instruments and Hedging Activity (Tables) | 12 Months Ended
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Dec. 31, 2019
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
​ | ​ | December 31, | ​ | December 31, | ​ | December 31, | ​ | December 31,
Interest Rate Derivatives |  | 2019 |  | 2018 |  | 2019 |  | 2018
Interest Rate Swap |  | 15 |  | 10 | ​ | $ | 240,000 | ​ | $ | 258,543
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 consolidated balance sheets (in thousands).
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Asset Derivatives
​ | ​ | December 31, 2019 | ​ | December 31, 2018
​ |  | Fair Value |  | Fair Value
Derivatives designated as cash flow hedges: |  | ​ |  |  | ​ |
Interest Rate Swaps | ​ | $ | 572 | ​ | $ | 2,539
​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Liability Derivatives
​ | ​ | December 31, 2019 | ​ | December 31, 2018
​ |  | Fair Value |  | Fair Value
Derivatives designated as cash flow hedges: |  | ​ |  |  | ​ |
Interest Rate Swaps | ​ | $ | 7,943 | ​ | $ | 1,135
Schedule of Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Loss) [Table Text Block] | The table below presents the effect of the Company’s derivative financial instruments in the consolidated statements of operations and other comprehensive loss for the years ended December 31, 2019 and 2018 (in thousands).
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Year Ended December 31, |  | ​ |  | 2019 |  | 2018 |  | ​ |  | 2019 |  | 2018
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Interest rate swaps | ​ | $ | (8,657) | ​ | $ | 193 | ​ | Interest Expense | ​ | $ | (118) | ​ | $ | (139)
Offsetting Assets And Liabilities [Table Text Block] |
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
​
Offsetting of Derivative Assets
As of December 31, 2018
​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | 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 | ​ | $ | 2,539 | ​ | $ | — | ​ | $ | 2,539 | ​ | $ | (575) | ​ | $ | — | ​ | $ | 1,964
​
Offsetting of Derivative Liabilities
As of December 31, 2018
​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | 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 | ​ | $ | 1,135 | ​ | $ | — | ​ | $ | 1,135 | ​ | $ | (575) | ​ | $ | — | ​ | $ | 560

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