Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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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.

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Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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- Definition

Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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-Publisher FASB
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- Definition

The number of derivative instruments of a particular group held by the entity.

+ References

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- Definition

Period the derivative contract is outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

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- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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No definition available.

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- Definition

Including the current and noncurrent portions, carrying value as of the balance sheet date of uncollateralized debt obligations (with maturities initially due after one year or beyond the operating cycle if longer).

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Fair value of financial instruments (Details)	6 Months Ended
Fair value of financial instruments (Details)	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($) derivative_instrument	Dec. 31, 2015 USD ($)
Fixed-Rate Debt \| Unsecured notes issued in a private placement
Debt Instrument [Line Items]
Carrying value	$ 85,700,000		$ 92,900,000
Fair Value, Inputs, Level 3 \| Fixed-Rate Debt \| Unsecured notes issued in a private placement
Debt Instrument [Line Items]
Fair value	90,100,000		$ 95,700,000
Not Designated as Hedging Instrument \| Foreign Exchange Contract
Debt Instrument [Line Items]
Notional value	$ 57,000,000
Weighted average maturity (in months)	1 month
Designated as Hedging Instrument \| Cross currency swap
Debt Instrument [Line Items]
Notional value	$ 11,100,000.0
Weighted average maturity (in months)	9 months
Designated as Hedging Instrument \| Cross currency swap \| Fair Value, Inputs, Level 2
Debt Instrument [Line Items]
Derivative asset	$ 4,300,000
Designated as Hedging Instrument \| Interest Rate Swap
Debt Instrument [Line Items]
Notional value		$ 40,000,000
Number of interest rate swaps \| derivative_instrument		2
Fair value liability interest rate swap	800,000
Prepaid Expenses and Other Current Assets \| Designated as Hedging Instrument \| Cross currency swap \| Fair Value, Inputs, Level 2
Debt Instrument [Line Items]
Derivative asset	2,300,000
Other Assets \| Designated as Hedging Instrument \| Cross currency swap \| Fair Value, Inputs, Level 2
Debt Instrument [Line Items]
Derivative asset	$ 2,000,000