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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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, expected to be settled after one year or the normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 45
-Paragraph 6
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-Publisher FASB
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- Definition

Fixed interest rate related to the interest rate derivative.

+ References

No definition available.

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- Definition

Floor rate on an interest rate derivative such as an interest rate floor or collar. If market rates falls below the floor rate, a payment or receipt is triggered on the contract.

+ References

No definition available.

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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, expected to be settled within one year or normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Current Liabilities
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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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.

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No definition available.

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- Definition

Number of interest rate derivative instruments held by the entity at the reporting date.

+ References

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Derivative Instruments - Derivatives Designated as Hedging Instruments Narrative (Details)	Sep. 30, 2017 USD ($)	May 31, 2017 USD ($) derivative_instrument	Dec. 31, 2016 USD ($)	Sep. 30, 2011 derivative_instrument
Derivatives, Fair Value [Line Items]
Derivative instruments	$ 29,721,000		$ 4,464,000
Derivatives designated as hedging instruments: \| Interest rate swaps
Derivatives, Fair Value [Line Items]
Derivative instruments	1,407,000		0
Derivative liability, current	$ 0		$ 5,218,000
Derivatives designated as hedging instruments: \| Cash Flow Hedging \| Interest rate swaps
Derivatives, Fair Value [Line Items]
Number of interest rate derivatives held (derivative instrument) \| derivative_instrument		4		2
Derivative, floor interest rate		1.00%
Derivatives designated as hedging instruments: \| Cash Flow Hedging \| Interest Rate Swap, Instrument One
Derivatives, Fair Value [Line Items]
Derivative, notional amount		$ 100,000,000
Derivative, fixed interest rate		1.756%
Derivatives designated as hedging instruments: \| Cash Flow Hedging \| Interest Rate Swap, Instrument Two
Derivatives, Fair Value [Line Items]
Derivative, notional amount		$ 100,000,000
Derivative, fixed interest rate		1.796%
Derivatives designated as hedging instruments: \| Cash Flow Hedging \| Interest Rate Swap, Instrument Three
Derivatives, Fair Value [Line Items]
Derivative, notional amount		$ 200,000,000
Derivative, fixed interest rate		1.796%
Derivatives designated as hedging instruments: \| Cash Flow Hedging \| Interest Rate Swap, Instrument Four
Derivatives, Fair Value [Line Items]
Derivative, notional amount		$ 300,000,000
Derivative, fixed interest rate		1.763%