Fair Value Measurements - (Tables)

3 Months Ended

Mar. 31, 2014

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

The following tables provide the assets and liabilities carried at fair value measured on a recurring basis at March 31, 2014 and December 31, 2013:



			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, 2014
Assets:
Available-for-sale debt securities:
Municipal notes and bonds	$	127,618	$	—	$	127,618	$	—
Auction rate securities	295		—		—		295
Total Assets	$	127,913	$	—	$	127,618	$	295
Liabilities:
Contingent consideration - acquisitions	$	5,283	$	—	$	—	$	5,283
Foreign currency forward contracts	21		—		21		—
Total Liabilities	$	5,304	$	—	$	21	$	5,283
December 31, 2013
Assets:
Available-for-sale debt securities:
Municipal notes and bonds	$	86,305	$	—	$	86,305	$	—
Auction rate securities	277		—		—		277
Foreign currency forward contracts	6		—		6		—
Total Assets	$	86,588	$	—	$	86,311	$	277
Liabilities:
Contingent consideration - acquisitions	$	5,208	$	—	$	—	$	5,208
Total Liabilities	$	5,208	$	—	$	—	$	5,208

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, 2014:



	Fair Value Measurements Using Significant Unobservable Inputs (Level 3)
Assets:
Balance at December 31, 2013	$	277
Unrealized gain in accumulated other comprehensive loss	18
Purchases	—
Sales, issuances, and settlements	—
Transfers into (out of) Level 3	—
Balance at March 31, 2014	$	295

Liabilities:
Balance at December 31, 2013	$	5,208
Additions	—
Total gain (loss) included in earnings	(75		)
Payments	—
Transfers into (out of) Level 3	—
Balance at March 31, 2014	$	5,283

Fair value convertible senior notes [Table Text Block]

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



	March 31, 2014			December 31, 2013
Net carrying value of convertible senior notes	$	52,486		$	51,751
Estimated fair value of convertible senior notes	$	60,390		$	59,340
Estimated interest rate used in discounted cash flow model	3.5		%	4.2		%
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.

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