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Defined Contribution Plans (Details) | 12 Months Ended
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Dec. 31, 2016 USD ($) employee | Dec. 31, 2015 USD ($) employee | Dec. 31, 2014 USD ($) employee
Defined Contribution Plan Disclosure [Line Items] |  |  |
Employer matching contribution, percentage of employees' pay | 4.00% |  |
Defined Contribution Plan, contributions paid | $ 11,400,000 | $ 10,100,000 | $ 13,600,000
Multiemployer Defined Contributory Trust Plan [Member] |  |  |
Defined Contributory Trust [Abstract] |  |  |
Number of employees in plan | employee | 1,369 | 1,431 | 1,378
Required employer's contribution per hour per active employee | $ 0.80 | $ 0.75 | $ 0.50
Required defined contributory trust contribution, percent of earnings | 4.00% | 4.00% | 4.00%
Period Contributions | $ 2,800,000 | $ 2,800,000 | $ 2,100,000
Defined Contribution Savings Plan [Member] | Minimum [Member] |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Percentage Contributed for Additional Performance Target |  |  | 1.00%
Defined Contribution Savings Plan [Member] | Maximum [Member] |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Percentage Contributed for Additional Performance Target |  |  | 2.00%

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- Definition Defined Contributory Trust [Abstract] + References No definition available. + Details
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- Definition Represents the number of employees in multiemployer plans. + References No definition available. + Details
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- Definition Percentage contributed for additional performance target determined by company performance and the employee's years of service + References No definition available. + Details
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- Definition Represents the required employer's contribution per hour per active employee. + References No definition available. + Details
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- Definition The amount of the cost recognized during the period for defined contribution plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
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- Definition Amount of contributions made to multiemployer plans by the employer. A multiemployer plan is a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450702-114947 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450691-114947 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 5 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450657-114947 + Details
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- Definition Percentage of contributions required by a collective bargaining arrangement to contributions required by all collective bargaining arrangements related to a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 5 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450657-114947 + Details
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