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

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Fixed interest rate related to the interest rate derivative.

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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.

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The portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness.

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

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Derivative Instruments - Derivatives Designated as Hedging Instruments Narrative (Details)	6 Months Ended
	Jun. 30, 2016 USD ($)	Jun. 30, 2017 USD ($)	May 31, 2017 USD ($) derivative_instrument	Dec. 31, 2016 USD ($)	Sep. 30, 2011 USD ($) derivative_instrument
Derivatives, Fair Value [Line Items]
Derivative asset		$ 49,171,000		$ 4,464,000
Derivative instruments		49,171,000		4,464,000
Gain or (loss) recognized in income, on the ineffective portion of derivative instruments	$ 0
Derivatives designated as hedging instruments: \| Interest rate swaps
Derivatives, Fair Value [Line Items]
Derivative instruments		881,000		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%		1.25%
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%
Derivatives designated as hedging instruments: \| Cash Flow Hedging \| Fixed Rate 2.61% Interest Rate Swap
Derivatives, Fair Value [Line Items]
Derivative, notional amount					$ 450,000,000
Derivative, fixed interest rate					2.61%
Derivatives designated as hedging instruments: \| Cash Flow Hedging \| Fixed Interest 2.71% Interest Rate Swap
Derivatives, Fair Value [Line Items]
Derivative, notional amount					$ 300,000,000
Derivative, fixed interest rate					2.71%