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Fair value measurements - Narrative (Details) - USD ($)	Jun. 30, 2017	Dec. 31, 2016
Financial Liabilities
Assets fair value		$ 0
Significant transfers	$ 0
Restricted investment	70,400,000	$ 69,700,000
Reported Value
Financial Liabilities
Capital lease obligations	80,000,000
Debt fair value	383,500,000
Estimate of Fair Value
Financial Liabilities
Capital lease obligations	90,300,000
Level 1 | Fair Value, Measurements, Recurring
Financial Liabilities
Restricted investment	70,400,000
Restricted investments, fair value	$ 68,100,000

X

- Definition

This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a recurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements.

+ References

No definition available.

+ Details

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- Definition

Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 30
-Section 50
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- Definition

Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
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- Definition

Amount of transfers of assets measured on a recurring basis out of Level 1 of the fair value hierarchy into Level 2.

+ References

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

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- Definition

Investments which are not defined as or included in marketable (debt, equity, or other) securities whose use is restricted in whole or in part, generally by contractual agreements or regulatory requirements. For use in an unclassified balance sheet.

+ References

No definition available.

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- Definition

The aggregate value of all restricted investments.

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