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)
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The aggregate fair value of assets needed to immediately settle the derivative instruments with credit-risk-related contingent features if the credit-risk-related contingent features were triggered at the end of the reporting period.

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The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months.

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Fair value, before 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 elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

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Fixed interest rate related to the interest rate derivative.

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Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

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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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The effective portion of gains on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period.

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The effective portion of loss reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

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The effective portion of losses on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period.

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

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Variable interest rate in effect as of the balance sheet date related to the interest rate derivative.

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Derivative Instruments (Details) $ in Thousands	12 Months Ended
Derivative Instruments (Details) $ in Thousands	Dec. 31, 2015 USD ($) Interest_Rate_Swaps	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Derivative [Line Items]
Change in fair value of derivative instruments	$ (1)	$ (90)	$ (291)
Interest Rate Swap [Member]
Derivative [Line Items]
Assets Needed for Immediate Settlement, Aggregate Fair Value	9,000
Derivative Instruments, Gain Recognized in Other Comprehensive Income (Loss), Effective Portion			772
Derivative Instruments, Loss Recognized in Other Comprehensive Income (Loss), Effective Portion	$ (6,851)	(7,999)
Number of derivative instruments held \| Interest_Rate_Swaps	1
Derivative, notional amount	$ 920,000
Derivative, Fixed Interest Rate	1.77%
Estimated gain (loss) expected to be reclassified from accumulated other comprehensive income to income	$ (4,900)
LIBOR [Member] \| Interest Rate Swap [Member]
Derivative [Line Items]
Derivative instrument, term for variable interest rate	1 month
Minimum [Member] \| Interest Rate Swap [Member]
Derivative [Line Items]
Derivative, Variable Interest Rate	1.00%
Interest Expense, Net [Member] \| Interest Rate Swap [Member]
Derivative [Line Items]
Amount of Loss Reclassified from Accumulated Other Comprehensive Income into Income (Effective Portion)	$ (8,548)	(12,896)	(13,133)
Change in Fair Value of Derivative Instruments [Member] \| Interest Rate Swap [Member]
Derivative [Line Items]
Amount of Gain (Loss) on Derivatives Recognized in Income (Ineffective Portion and Amount Excluded from Effectiveness Testing)	(1)	(90)	(87)
Designated as Hedging Instrument [Member] \| Other Accrued Liabilities [Member] \| Interest Rate Swap [Member]
Derivative [Line Items]
Derivative liability, fair value	0	4,149
Designated as Hedging Instrument [Member] \| Other Long-term Liabilities [Member] \| Interest Rate Swap [Member]
Derivative [Line Items]
Derivative liability, fair value	$ 8,334	$ 6,105
Not Designated as Hedging Instrument [Member] \| Interest Rate Products [Member]
Derivative [Line Items]
Change in fair value of derivative instruments			$ (200)
Cash Flow Hedges [Member] \| Designated as Hedging Instrument [Member] \| Fixed Interest Rate [Member] \| Interest Rate Swap [Member]
Derivative [Line Items]
Effective fixed interest rate on hedged variable interest rate debt	5.02%