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Nabors Industries Ltd. (NYSE: NBR) gained a whopping 73% in 2014's first half. The Bermuda-based oil drilling and rig operator also benefited from rising crude prices. Yet some of NBR's biggest gains have come in the last several weeks. In late June, NBR entered into an agreement with oil field services provider C&J Energy Services Inc. (Nasdaq: CJES) to merge its completion and production services located in the United States and Canada with C&J for some $2.86 billion in cash and stock. The move is expected to benefit both companies.