Financial Instruments, Fair Value Measurement, Credit Risk and Foreign Exchange Risk - Schedule of Fair Value of Trading Securities, Derivative Assets, and RSU and PSU Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Fair Value Disclosures [Abstract]
Investment - current and long-term assets	$ 94,741	$ 41,435
Fair value of assets	94,741	41,435
Derivative liability	775	1,017
PSU and DSU liability	7,859	17,683
Fair value of liabilities	$ 8,634	$ 18,700