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Commitments and Contingencies	3 Months Ended
Commitments and Contingencies	Mar. 31, 2018
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Environmental and Legal Matters From time to time, we are involved in various proceedings incidental to our businesses, and we are subject to a variety of environmental and pollution control laws and regulations in all jurisdictions in which we operate. Although the ultimate outcome of these proceedings cannot be determined with certainty, based on presently available information management believes that adequate reserves have been established for probable losses with respect thereto. Management further believes that the ultimate outcome of these matters could be material to operating results in any given quarter but will not have a materially adverse effect on our long-term financial condition, our results of operations, or our cash flows. Collective Bargaining Agreements As of March 31, 2018, we employed approximately 1,500 persons on a full-time basis. Additionally, at March 31, 2018, approximately 34% of our employees were represented by various local labor union Collective Bargaining Agreements (“CBAs”), of which approximately 11% of CBAs are up for renewal in fiscal 2018 or are currently expired and are under negotiation. We subsequently acquired Cedar Creek Holdings, Inc. (“Cedar Creek”) on April 13, 2018. In connection with this acquisition, the total number of our full-time employees increased to approximately 2,600 persons. There are no unionized employees at Cedar Creek. See Note 12 for additional information regarding the acquisition of Cedar Creek.