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Commitments and Contingencies - Collective Bargaining Agreements and Environmental Contingencies (Details) | 12 Months Ended
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Dec. 31, 2018 employee item location
Employees covered by collective bargaining agreements |
Collective Bargaining Agreements |
Number of Location Entity Operates | location | 51
Expiration period of collective bargaining agreements | 7 years
Total employees | Employees covered by collective bargaining agreements |
Collective Bargaining Agreements |
Percentage of employees covered by collective bargaining agreements | 11.00%
Number of employees | employee | 1,780
Number of collective bargaining agreements that expire over the next seven years | item | 40
Employees covered by collective bargaining agreements that expire during 2019 |
Collective Bargaining Agreements |
Number of employees | employee | 400
Employees covered by collective bargaining agreements that expire during 2019 | Employees covered by collective bargaining agreements |
Collective Bargaining Agreements |
Number of collective bargaining agreements that expire within one year | item | 13

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- Definition Represents the number of collective bargaining agreements that expire within one year. + References No definition available. + Details
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- Definition Represents the number of collective bargaining agreements that will expire at various times over the next seven years. + References No definition available. + Details
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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6351-108592 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13531-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6404-108592 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13537-108611 + Details
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