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Derivative Financial Instruments (Tables) | 6 Months Ended
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Jun. 30, 2019
Derivative Financial Instruments |
Schedule of gains and (losses) and weighted average notional amount of derivatives | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three months ended June 30, 2018 | ​ | Six months ended June 30, 2018 | ​
​ |  | Gains (Losses) |  | Weighted average notional amount |  | Gains (Losses) |  | Weighted average notional amount | ​
​ | ​ | (in thousands) | ​
Foreign currency exchange forwards | ​ | $ | 199 | ​ | $ | 5,376 | ​ | $ | 216 | ​ | $ | 2,392 | ​
​

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- Definition Tabular disclosure of the location and amount of gains and losses reported in the statement of financial performance and weighted average notional amounts of outstanding derivative positions. + References No definition available. + Details
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