Net Income (Loss) Attributable to Noncontrolling Interests - Assets and Liabilities of Consolidated VIEs (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
TMAC
NET INCOME (LOSS) ATTRIBUTABLE TO NONCONTROLLING INTERESTS
Total Assets		$ 38
Total Liabilities		17
PTNNT - Batu Hijau
NET INCOME (LOSS) ATTRIBUTABLE TO NONCONTROLLING INTERESTS
Total Assets	$ 3,505	3,150
Total Liabilities	$ 1,166	$ 1,155