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Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2020
Fair Value Measurements |
Schedule of Derivative Liabilities at Fair Value [Table Text Block] | The table below presents the Company’s assets and liabilities measured at fair value on a recurring basis as of December 31, 2020 and December 31, 2019 (in thousands):
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​ |  | Total Fair Value |  | Level 2
December 31, 2020 | ​ | ​ | ​ | ​ | ​ | ​
Derivative assets - interest rate swaps | ​ | $ | 2,286 | ​ | $ | 2,286
Derivative liabilities - interest rate swaps | ​ | $ | 16,985 | ​ | $ | 16,985
​ | ​ | ​ | ​ | ​ | ​ | ​
December 31, 2019 | ​ | ​ | ​ | ​ | ​ | ​
Derivative assets - interest rate swaps | ​ | $ | 572 | ​ | $ | 572
Derivative liabilities - interest rate swaps | ​ | $ | 7,943 | ​ | $ | 7,943

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