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Fair Value Measurements (Tables) | 9 Months Ended
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Sep. 30, 2019
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 September 30, 2019 and December 31, 2018 (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Total Fair Value |  | Level 2
September 30, 2019 | ​ | ​ | ​ | ​ | ​ | ​
Derivative liabilities - interest rate swaps | ​ | $ | 14,016 | ​ | $ | 14,016
​ | ​ | ​ | ​ | ​ | ​ | ​
December 31, 2018 | ​ | ​ | ​ | ​ | ​ | ​
Derivative assets - interest rate swaps | ​ | $ | 2,539 | ​ | $ | 2,539
Derivative liabilities - interest rate swaps | ​ | $ | 1,135 | ​ | $ | 1,135

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