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Fair Value Measurements (Tables) | 3 Months Ended
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Mar. 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 March 31, 2020 and December 31, 2019 (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Total Fair Value |  | Level 2
March 31, 2020 | ​ | ​ | ​ | ​ | ​ | ​
Derivative assets - interest rate swaps | ​ | $ | — | ​ | $ | —
Derivative liabilities - interest rate swaps | ​ | $ | 40,396 | ​ | $ | 40,396
​ | ​ | ​ | ​ | ​ | ​ | ​
December 31, 2019 | ​ | ​ | ​ | ​ | ​ | ​
Derivative assets - interest rate swaps | ​ | $ | 572 | ​ | $ | 572
Derivative liabilities - interest rate swaps | ​ | $ | 7,943 | ​ | $ | 7,943

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- Definition Tabular disclosure of derivative liabilities at fair value. + References No definition available. + Details
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