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Like-Kind Exchanges	9 Months Ended
Like-Kind Exchanges	Sep. 30, 2017
Like-Kind Exchanges [Abstract]
Like-Kind Exchanges	Prepaid expenses and other current assets included $850,000 held by Internal Revenue Code Section 1031 like-kind exchange intermediaries at December 31, 2016. Deferred tax and other assets included $1.9 million held by like-kind exchange intermediaries at December 31, 2016. There were no amounts held by like-kind exchange intermediaries at September 30, 2017.