 NEW YORK--BUSINESS WIRE--International Seaways, Inc. NYSE: INSW the Company or INSW, one of the largest tanker companies worldwide providing energy transportation services for crude oil and petroleum products in International Flag markets, today announced that its two joint ventures with Euronav NV have signed 10-year contract extensions with North Oil Company NOC, the operator of the Al-Shaheen oil field, whose shareholders are Qatar Petroleum Oil Gas Limited and Total E 