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Capital Stock	3 Months Ended
Capital Stock	Mar. 31, 2019
Equity [Abstract]
Capital Stock	Capital Stock Exercise of Options For the three months ended March 31, 2019 and 2018, 218,572 and 78,859 shares, respectively, were exercised at a weighted-average exercise price of $3.55 and $6.49 per share, respectively, with net cash proceeds of $0.8 million and $0.4 million, respectively.