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Contingent matters	6 Months Ended
Contingent matters	Jun. 30, 2018
Commitments and Contingencies Disclosure [Abstract]
Contingent matters	Contingent matters We are involved in various lawsuits and claims in the ordinary course of business. We are not able to estimate the loss or range of losses for some of these matters. We have recorded accruals for losses that are considered probable and reasonably estimable. We do not believe that it is reasonably possible the ultimate disposition of any of the lawsuits currently pending against the Company could have a material adverse effect on our liquidity, financial position or results of operations.