Share Capital - PSU, DSU, RSU and Stock Option Activity (Details)	3 Months Ended
	Mar. 31, 2016 $ / shares shares
Number of Outstanding Stock Options
Beginning Balance (in shares)	12,851,557
Granted (in shares)	1,286,525
Exercised (in shares)	(500,000)
Forfeited (in shares)	(457,436)
Expired (in shares)	(127,051)
Ending Balance (in shares)	13,053,595
Weighted Average Exercise Price/Stock Option ($)
Weighted Average Exercise Price $/Option, beginning balance (in dollars per share) | $ / shares	$ 4.60
Weighted Average Exercise Price $/Option, Granted (in dollars per share) | $ / shares	2.65
Weighted Average Exercise Price $/Options, Exercised (in dollars per share) | $ / shares	2.40
Weighted Average Exercise Price $/Options, Forfeited (in dollars per share) | $ / shares	(4.71)
Weighted Average Exercise Price $/Options, Expired (in dollars per share) | $ / shares	(6.49)
Weighted Average Exercise Price $/Option, ending balance (in dollars per share) | $ / shares	$ 4.46
PSUs [Member]
Number of Outstanding Share Units
Beginning Balance (in shares)	0
Granted (in shares)	2,297,700
Exercised (in shares)	0
Forfeited (in shares)	0
Expired (in shares)	0
Ending Balance (in shares)	2,297,700
DSUs [Member]
Number of Outstanding Share Units
Beginning Balance (in shares)	0
Granted (in shares)	59,229
Exercised (in shares)	0
Forfeited (in shares)	0
Expired (in shares)	0
Ending Balance (in shares)	59,229
RSUs [Member]
Number of Outstanding Share Units
Beginning Balance (in shares)	1,015,457
Granted (in shares)	0
Exercised (in shares)	(272,397)
Forfeited (in shares)	(166,685)
Expired (in shares)	0
Ending Balance (in shares)	576,375