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Level 4 Postretirement Benefit Plans (Details) (USD $)	5 Months Ended	12 Months Ended
	Jun. 01, 2012	Dec. 31, 2013 employee	Dec. 31, 2012	Dec. 31, 2011
Retirement and Benefit Plans [Abstract]
Number of employees in multiemployer health and welfare plan		625
Required heath and welfare contribution by employer per active employee	$ 5.50	$ 5.00
Multiemployer health and welfare plan, period contributions		$ 6,900,000	$ 6,700,000	$ 6,900,000

X

- Definition

Amount of contributions made to multiemployer health and welfare plan by the employer.

+ References

No definition available.

+ Details

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X

- Definition

Number of employees who participate in a multiemployer health and welfare plan that covers medical, dental, and life insurance for certain active and retired employees.

+ References

No definition available.

+ Details

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X

- Definition

Required Heath and Welfare Contribution by Employer Per Active Employee

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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X

- Details

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