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Fair Value of Financial Instruments (Tables)

3 Months Ended

Mar. 31, 2018

Fair Value of Financial Instruments [Abstract]

Available-for-sale Securities



	March 31,			December 31,
	2018			2017
Amortized cost	$	348,690		$	324,875
Unrealized gains (losses)		(551)			(493)
Fair value	$	348,139		$	324,382



Unrealized Gains (Losses) on Available-for-sale Securities in OCI



	Three months ended March 31,
	2018			2017
Unrealized gains (losses) on available-for-sale securities	$	(144)		$	(276)
Unrealized gains (losses) on available-for-sale securities, net of tax	$	(101)		$	(182)



Unrealized Gains (Losses) On Trading Securities Held In Rabbi Trust



	Three months ended March 31,
	2018			2017
Unrealized gains (losses) on trading securities held in rabbi trust	$	(1,623)		$	463



X

- Definition

Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 320
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=75019621&loc=d3e62557-112803

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- Definition

Tabular disclosure of the realized and unrealized gains and losses reported in the statement of income which have resulted from the sale and holding of marketable securities, respectively, as well as the sale or disposal of cost method investments. Such amounts would include realized gains and losses on the sale or disposal of trading, available-for-sale, and held-to-maturity securities, unrealized gains and losses on trading securities, unrealized gains and losses on available-for-sale and held-to-maturity securities transferred to the trading securities category, realized gains and losses on the sale or disposal of cost method investments, and losses recognized for other than temporary impairments (OTTI) of such investments.

+ References

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Tabular disclosure of unrealized gains and losses on investments.

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