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Fair Value Measurements (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Assets:
Derivative financial instruments	$ 278	$ 0
Liabilities:
Derivative financial instruments	0	487
Fair Value, Measurements, Recurring
Assets:
Derivative financial instruments	278
Investments:
Cash surrender value of life insurance policies - deferred compensation plan	30,706	30,351
Liabilities:
Derivative financial instruments		487
Fair Value, Measurements, Recurring | Deferred compensation plan
Liabilities:
Deferred compensation plan	26,158	26,797
Fair Value, Measurements, Recurring | Marketable securities - other
Investments:
Marketable securities - other	54	113
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets (Level 1)
Assets:
Derivative financial instruments	0
Investments:
Cash surrender value of life insurance policies - deferred compensation plan	0	0
Liabilities:
Derivative financial instruments		0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets (Level 1) | Deferred compensation plan
Liabilities:
Deferred compensation plan	0	0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets (Level 1) | Marketable securities - other
Investments:
Marketable securities - other	54	113
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)
Assets:
Derivative financial instruments	278
Investments:
Cash surrender value of life insurance policies - deferred compensation plan	30,706	30,351
Liabilities:
Derivative financial instruments		487
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Deferred compensation plan
Liabilities:
Deferred compensation plan	26,158	26,797
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Marketable securities - other
Investments:
Marketable securities - other	0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3)
Assets:
Derivative financial instruments	0
Investments:
Cash surrender value of life insurance policies - deferred compensation plan	0	0
Liabilities:
Derivative financial instruments		0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Deferred compensation plan
Liabilities:
Deferred compensation plan	0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Marketable securities - other
Investments:
Marketable securities - other	$ 0	$ 0

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