Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2011

Fair Value Measurements (Tables) [Abstract]

Assets and liabilities measured at fair value on recurring basis


	Fair Value Measurements at June 30, 2011
	Quoted Prices		Significant
	in Active		Other		Significant		Total Carrying
	Markets for		Observable		Unobservable		Value in the
	Identical Assets		Inputs		Inputs		Consolidated
	(Level 1)		(Level 2)		(Level 3)		Balance Sheets
Assets:
Cash equivalents	$	—	$	93,789	$	—	$	93,789
Marketable securities
Equity securities		38,336		—		—		38,336
Municipal securities		—		314,390		—		314,390

Total marketable securities		38,336		314,390		—		352,726
Deferred compensation plan assets		—		6,595		—		6,595

Total assets at fair value	$	38,336	$	414,774	$	—	$	453,110


Liabilities:
Deferred compensation plan liabilities	$	—	$	6,226	$	—	$	6,226

Total liabilities at fair value	$	—	$	6,226	$	—	$	6,226


	Fair Value Measurements at December 31, 2010
	Quoted Prices		Significant
	in Active		Other		Significant		Total Carrying
	Markets for		Observable		Unobservable		Value in the
	Identical Assets		Inputs		Inputs		Consolidated
	(Level 1)		(Level 2)		(Level 3)		Balance Sheets
Assets:
Cash equivalents	$	—	$	1,211	$	—	$	1,211
Marketable securities
Equity securities		52,130		—		—		52,130
Treasury securities		—		7,891		—		7,891
Municipal securities		—		366,300		—		366,300
Corporate debt securities		—		3,644		—		3,644

Total marketable securities		52,130		377,835		—		429,965
Deferred compensation plan assets		—		6,298		—		6,298

Total assets at fair value	$	52,130	$	385,344	$	—	$	437,474


Liabilities:
Deferred compensation plan liabilities	$	—	$	6,246	$	—	$	6,246

Total liabilities at fair value	$	—	$	6,246	$	—	$	6,246

- Definition

This element represents the disclosure related to the fair value measurement of assets and liabilities which includes [financial] instruments measured at fair value that are classified in stockholders' equity. Such assets and liabilities may be measured on a recurring or nonrecurring basis. The disclosures which may be required or desired include: (1) for assets and liabilities measured on a recurring basis, disclosure may include: (a) the fair value measurements at the reporting date; (b) the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets or liabilities (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3); (c) for fair value measurements using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period attributable to the following: (i) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets), and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (ii) purchases, sales, issuances, and settlements (net); (iii) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs); (d) the amount of the total gains or losses for the period in subparagraph (c) (i) above included in earnings (or changes in net assets) that are attributable to the change in unrealized gains or losses relating to those assets and liabilities still held at the reporting date and a description of where those unrealized gains or losses are reported in the statement of income (or activities); (e) the valuation technique(s) used to measure fair value and a discussion of changes in valuation techniques, if any, during the period and (2) for assets and liabilities that are measured at fair value on a nonrecurring basis (for example, impaired assets) disclosure may include, in addition to (a) above: (a) the reasons for the fair value measurements recorded; (b) the same as (b) above; (c) for fair value measurements using significant unobservable inputs (Level 3), a description of the inputs and the information used to develop the inputs; and (d) the valuation technique(s) used to measure fair value and a discussion of changes, if any, in the valuation technique(s) used to measure similar assets and/or liabilities in prior periods.

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