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Level 4 Defined Contribution Plans (Details) (USD $) | 12 Months Ended
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Dec. 31, 2013 employee | Dec. 31, 2012 | Dec. 31, 2011
Defined Contribution Plans [Line Items] |  |  |
Defined contribution plan employer matching contribution, percent | 4.00% |  |
Defined contribution plan matching contribution expense | $ 13,200,000 | $ 14,300,000 | $ 7,700,000
Defined Contributory Trust [Abstract] |  |  |
Number of employees in multiemployer defined contributory trust plan | 647 |  |
Required defined contributory trust contribution per hour per active employee | 0.45 |  |
Defined Contributory Trust Plan, Period Contributions | $ 600,000 |  |
Minimum [Member] |  |  |
Defined Contribution Plans [Line Items] |  |  |
Amount contributed for additional performance target, percent | 1.00% | 3.00% |
Maximum [Member] |  |  |
Defined Contribution Plans [Line Items] |  |  |
Amount contributed for additional performance target, percent | 2.00% | 5.00% |

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- Definition Amount 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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- Details
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- Details
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- Definition Amount of contributions made to the defined contributory trust plan by the employer. + References No definition available. + Details
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- Definition Number of employees in multiemployer defined contributory trust plan + References No definition available. + Details
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- Definition Required defined contributory trust 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=6414718&loc=d3e28014-114942 + Details
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X
- 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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