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Capital Stock	3 Months Ended
Capital Stock	Mar. 31, 2018
Equity [Abstract]
Capital Stock	Capital Stock Exercise of Options For the three months ended March 31, 2018 and 2017, 78,859 and 40,582 shares, respectively, were exercised at a weighted-average exercise price of $6.49 and $2.45 per share, respectively, with net cash proceeds of $0.4 million and $0.1 million, respectively.