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Stock Repurchase Plan	12 Months Ended
Stock Repurchase Plan	Dec. 31, 2017
Equity [Abstract]
Stock Repurchase Plan	Stock Repurchase Plan On July 26, 2016, the Board of Directors authorized a stock repurchase plan under which the Company can repurchase up to $100 million of its common stock. The repurchase plan has no set expiration date and any repurchased shares are expected to be cancelled. No repurchases have been made pursuant to this plan during 2017.