Income taxes	3 Months Ended
Mar. 31, 2017
Income Tax Disclosure [Abstract]
Income taxes	Income taxes In the three months ended March 31, 2017, the income tax benefit was $5,266,000 (March 31, 2016 - $9,596,000). This reduction in income tax benefits is mainly as a result of not being able to recognize a deferred tax credit in respect of certain UK costs in the three months ended March 31, 2017.

Income taxes

3 Months Ended

Mar. 31, 2017

In the three months ended March 31, 2017, the income tax benefit was $5,266,000 (March 31, 2016 - $9,596,000). This reduction in income tax benefits is mainly as a result of not being able to recognize a deferred tax credit in respect of certain UK costs in the three months ended March 31, 2017.