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Financial Instruments (Details) - Recurring - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Restricted investment:
Rabbi Trust	$ 15,521	$ 13,071
Fixed income securities	1,848	1,717
Interest rate cap derivatives		93
Quoted Prices in Active Markets (Level 1)
Restricted investment:
Rabbi Trust	0	0
Fixed income securities	0	0
Interest rate cap derivatives		0
Significant Other Observable Inputs (Level 2)
Restricted investment:
Rabbi Trust	15,521	13,071
Fixed income securities	1,848	1,717
Interest rate cap derivatives		93
Significant Unobservable Inputs (Level 3)
Restricted investment:
Rabbi Trust	0	0
Fixed income securities	0	0
Interest rate cap derivatives		0
Interest rate swap derivatives
Liabilities:
Interest rate swap derivatives	26,896	20,835
Interest rate swap derivatives | Quoted Prices in Active Markets (Level 1)
Liabilities:
Interest rate swap derivatives	0	0
Interest rate swap derivatives | Significant Other Observable Inputs (Level 2)
Liabilities:
Interest rate swap derivatives	26,896	20,835
Interest rate swap derivatives | Significant Unobservable Inputs (Level 3)
Liabilities:
Interest rate swap derivatives	$ 0	$ 0

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- Definition

Rabbi trust.

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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. Includes assets not subject to a master netting arrangement and not elected to be offset.

+ References

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Fair value of investments in debt securities classified as held-to-maturity.

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