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Fair Value Measurements (Tables) | 6 Months Ended
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Jun. 30, 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 June 30, 2020 and December 31, 2019 (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Total Fair Value |  | Level 2
June 30, 2020 | ​ | ​ | ​ | ​ | ​ | ​
Derivative assets - interest rate swaps | ​ | $ | — | ​ | $ | —
Derivative liabilities - interest rate swaps | ​ | $ | 42,641 | ​ | $ | 42,641
​ | ​ | ​ | ​ | ​ | ​ | ​
December 31, 2019 | ​ | ​ | ​ | ​ | ​ | ​
Derivative assets - interest rate swaps | ​ | $ | 572 | ​ | $ | 572
Derivative liabilities - interest rate swaps | ​ | $ | 7,943 | ​ | $ | 7,943

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