The last few months the look of the price action looks like a bearish rising wedge, in Elliott wave terms we call that an ending diagonal, the break of 170.00 is a strong sign that wave  has likely ended and started a move lower, as well as suggesting the bull cycle from the 2008 lows has ended and completed and impulse wave. If you own the stock you may want to take profits as if the advance has ended, a move towards 130.00 – 120.00 or lower is expected (depending on the larger picture wave count from the inception).
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