Derivatives (Details 5) - Not designated as hedging $ in Millions	12 Months Ended
Dec. 31, 2016 USD ($)
Long-term Interest Rate Swap, 2012
Open interest rate contracts
Year Entered	2012
Year of Maturity	2023
Initial Notional Amount (in millions)	$ 23.0
Hedged Item	Interest rate component of debt - not accounted for as a hedge
Interest Rate	1.90%
Long-term Interest Rate Collar, 2013 \| Cash flow hedge
Open interest rate contracts
Year Entered	2013
Year of Maturity	2021
Initial Notional Amount (in millions)	$ 40.0
Hedged Item	Interest rate component of debt - not accounted for as a hedge
Long-term Interest Rate Collar, 2013 \| Cash flow hedge \| Minimum
Open interest rate contracts
Interest Rate	2.90%
Long-term Interest Rate Collar, 2013 \| Cash flow hedge \| Maximum
Open interest rate contracts
Interest Rate	4.80%

Open interest rate contracts.

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- Definition

Year entered.

+ References

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+ Details

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- Definition

Year of maturity.

+ References

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- Definition

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

+ References

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

+ Details

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- Definition

Description of the hedged item related to the derivative. Includes the type of instrument hedged, contract amount, term, and so forth.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5579240-113959

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- Definition

Fixed interest rate related to the interest rate derivative.

+ References

No definition available.

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