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Assets Held For Sale	6 Months Ended
Assets Held For Sale	Jun. 30, 2019
Assets Held For Sale [Abstract]
Assets Held For Sale	18. Assets Held for Sale In the second quarter of 2019, we entered into an agreement to trade-in certain transportation equipment to offset replacement equipment expected to be delivered in 2020. The net book value of the transportation equipment has been reduced to the expected trade in value of $15.8 million resulting in a $2.3 million impairment charge in the second quarter of 2019.