CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Common Stock	Accumulated Other Comprehensive (Loss) Income	Accumulated Deficit	Total
Balance at Dec. 31, 2015	$ 1,359,144	$ (825)	$ (940,027)	$ 418,292
Balance (in shares) at Dec. 31, 2015	298,634
Increase (Decrease) in Shareholders' Equity
Stock-based compensation (note 9)	$ 491			491
Return of capital distribution (note 8)	(1,491)			(1,491)
Exercise of stock options (note 8)	$ 1,873			1,873
Exercise of stock options (note 8) (in shares)	812
Share repurchase	$ (582)			(582)
Share repurchase (in shares)	(558)
Other comprehensive income (note 2)		2,382		2,382
Net income			21,338	21,338
Balance at Jun. 30, 2016	$ 1,359,435	1,557	(918,689)	442,303
Balance (in shares) at Jun. 30, 2016	298,888
Balance at Dec. 31, 2016	$ 1,360,345	1,666	(918,972)	443,039
Balance (in shares) at Dec. 31, 2016	299,570
Increase (Decrease) in Shareholders' Equity
Stock-based compensation (note 9)	$ 745			745
Return of capital distribution (note 8)	(1,498)			(1,498)
Shares issued in connection with the acquisition of Lexam VG Gold (note 15)	$ 38,141			38,141
Shares issued in connection with the acquisition of Lexam VG Gold (note 15) (in shares)	12,687
Exercise of stock options (note 8)	$ 47			47
Exercise of stock options (note 8) (in shares)	20
Other comprehensive income (note 2)		2,799		2,799
Net income			(4,728)	(4,728)
Balance at Jun. 30, 2017	$ 1,397,780	$ 4,465	$ (923,700)	$ 478,545
Balance (in shares) at Jun. 30, 2017	312,277