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Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717

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- Definition

Amount of required minimum payments for employee agreements in excess of one year due in the next fiscal year following the latest fiscal year.

+ References

No definition available.

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- Definition

Amount of required minimum payments for employee agreements in excess of one year due after next fiscal year following the latest fiscal year.

+ References

No definition available.

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- Definition

Expiration date of the employment agreements.

+ References

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- Definition

Notice period required for termination of employment agreement.

+ References

No definition available.

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- Definition

Number of employees covered under employee agreement during the period.

+ References

No definition available.

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- Definition

Renewal period for operating leases.

+ References

No definition available.

+ Details

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- Definition

Employment agreement renewal period.

+ References

No definition available.

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Commitments and Contingencies - Additional Information (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Operating Leased Assets [Line Items]
Rent expense	$ 25.6us-gaap_OperatingLeasesRentExpenseNet	$ 22.0us-gaap_OperatingLeasesRentExpenseNet	$ 20.8us-gaap_OperatingLeasesRentExpenseNet
Renewal period of employment agreements	1 year
Expiration date	Dec. 31, 2016
Minimum notice period required for termination of employment agreement	12 months
Future compensation - 2015	24.3
Future compensation - 2016 through 2019	$ 8.9
Executive Officer [Member]
Operating Leased Assets [Line Items]
Number of officers with the company had employee agreement	3
Minimum [Member]
Operating Leased Assets [Line Items]
Operating leases renewal period	1 year
Maximum [Member]
Operating Leased Assets [Line Items]
Operating leases renewal period	5 years