Defined Contribution Plans (Details) (USD $)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Defined Contribution Plan Disclosure [Line Items]
Employer matching contribution, percentage of employees' pay	4.00%
Defined Contribution Plan, contributions paid	$ 13,600,000	$ 13,200,000	$ 14,300,000
Multiemployer Defined Contributory Trust Plan [Member]
Defined Contributory Trust [Abstract]
Number of employees in plan	1,378	647
Required employer's contribution per hour per active employee	0.50	0.45
Required defined contributory trust contribution, percent of earnings	4.00%
Period Contributions	$ 2,100,000	$ 600,000
Defined Contribution Savings Plan [Member] \| Minimum [Member]
Defined Contribution Plan Disclosure [Line Items]
Percentage Contributed for Additional Performance Target	1.00%	1.00%	3.00%
Defined Contribution Savings Plan [Member] \| Maximum [Member]
Defined Contribution Plan Disclosure [Line Items]
Percentage Contributed for Additional Performance Target	2.00%	2.00%	5.00%

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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=6414718&loc=d3e28014-114942

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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=35742057&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=35742057&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=35742057&loc=SL14450657-114947

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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=35742057&loc=SL14450657-114947

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