Fair Value Measurements - (Tables)

3 Months Ended

Mar. 31, 2013

Fair Value, Measurement Inputs, Disclosure [Table Text Block]

The following tables provide the assets carried at fair value measured on a recurring basis at March 31, 2013 and December 31, 2012:



			Fair Value Measurements Using
	Carrying Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
March 31, 2013
Available-for-sale debt securities:
Municipal notes and bonds	$	80,489	$	—	$	80,489	$	—
Corporate bonds	501		—		501		—
Auction rate securities	330		—		—		330
Total available-for-sale debt securities	81,320		—		80,990		330
Derivatives:
Foreign currency forward contracts	200		—		200		—
Total derivatives	200		—		200		—
Total	$	81,520	$	—	$	81,190	$	330
December 31, 2012
Available-for-sale debt securities:
Municipal notes and bonds	$	64,117	$	—	$	64,117	$	—
Corporate bonds	500		—		500		—
Auction rate securities	346		—		—		346
Total available-for-sale debt securities	64,963		—		64,617		346
Derivatives:
Foreign currency forward contracts	268		—		268		—
Total derivatives	268		—		268		—
Total	$	65,231	$	—	$	64,885	$	346

Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]

This table presents a reconciliation for all assets and liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3) for the three months ended March 31, 2013:



	Fair Value Measurements Using Significant Unobservable Inputs (Level 3)
Balance at December 31, 2012	$	346
Unrealized loss in accumulated other comprehensive income	(16		)
Purchases, sales, issuances, and settlements	—
Transfers into (out of) Level 3	—
Balance at March 31, 2013	$	330

Fair value convertible senior notes [Table Text Block]

The following table reflects information pertaining to the Company’s convertible senior notes:



	March 31, 2013			December 31, 2012
Net carrying value of convertible senior notes	$	49,677		$	49,010
Estimated fair value of convertible senior notes	$	51,048		$	51,018
Estimated interest rate used in discounted cash flow model	9.4		%	9.4		%
Fair value of contingent interest	$	—		$	—

- Definition

Tabular disclosure of the fair value measurement of assets using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets) and gains or losses recognized in other comprehensive income (loss), 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); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs), by class of asset.

+ References+ Details

- Definition

The entire disclosure of the fair value measurement of assets and liabilities, which includes financial instruments measured at fair value that are classified in shareholders' equity, which may be measured on a recurring or nonrecurring basis.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19279-110258

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19190-110258

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 157

-Paragraph 33

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 157

-Paragraph 32

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 107

-Paragraph 10

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 157

-Paragraph 6

-Footnote 4

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details