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Related Party Transactions	9 Months Ended
Related Party Transactions	Sep. 30, 2018
Related Party Transactions [Abstract]
Related Party Transactions	(13) Related Party Transactions In May 2018, the Company purchased, and subsequently cancelled, 1,225,214 shares of its common stock, from an affiliate of Andrew S. Ogawa in a privately-negotiated transaction. Mr. Ogawa is a member of the Company’s Board of Directors. The stock was purchased at a price of $22.81 per share, which represented a 2% discount to the closing price on the date of purchase.