Debt (Details 2) - Revolving Loans $ in Millions	6 Months Ended
Jun. 30, 2015 USD ($)	May. 31, 2011 USD ($)
Debt
Maximum commitment	$ 468.5
US Dollar revolving loans under the Amended Credit Agreement
Debt
Maximum commitment	$ 250.0	$ 250.0
Maximum leverage ratio	3.0
Minimum interest coverage ratio	3.0
US Dollar revolving loans under the Amended Credit Agreement \| Minimum
Debt
Interest rate added to base rate (as a percent)	0.80%
Facility fee (as a percent)	0.20%
US Dollar revolving loans under the Amended Credit Agreement \| Maximum
Debt
Interest rate added to base rate (as a percent)	1.65%
Facility fee (as a percent)	0.35%
US Dollar revolving loans under the Amended Credit Agreement \| Prime rate
Debt
Variable interest rate base	prime rate
US Dollar revolving loans under the Amended Credit Agreement \| Federal funds rate
Debt
Variable interest rate base	federal funds rate
Interest rate added to base rate (as a percent)	0.50%
US Dollar revolving loans under the Amended Credit Agreement \| Adjusted LIBOR
Debt
Variable interest rate base	adjusted LIBOR
Interest rate added to base rate (as a percent)	1.00%
US Dollar revolving loans under the Amended Credit Agreement \| LIBOR
Debt
Variable interest rate base	LIBOR

The minimum interest coverage ratio required to be maintained under the terms of the debt agreement.

No definition available.

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- Definition

The maximum leverage ratio allowed under the terms of the debt agreement.

+ References

No definition available.

+ Details

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- Definition

The facility fee on the debt instrument, expressed as a percentage of the total borrowing capacity.

+ References

No definition available.

+ Details

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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

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- Definition

The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

+ References

No definition available.

+ 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

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19(b),22(b))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

+ Details

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- Details

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