Some CEOs are great are starting companies, some are great at running established companies, and some are great at turning companies around. Few, it seems, are great at two or more of those things. On that note, it will be a tough morning for Crocs. The company’s stock dropped nearly 50 percent yesterday in after-hours trading following the company’s disclosure that it expects earnings to be below its previous forecasts. Crocs stock, which traded as high as $74.75 last Halloween, was at $4.96 last night.