Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2013

Schedule of information by level for assets and liabilities that are measured at fair value on a recurring basis

Description	Balance at December 31, 2012		Level 1		Level 2		Level 3
Assets:
Available-for-sale securities(1):
Certificate of deposits	$	10,021	$	—	$	10,021	$	—
Municipal bonds and notes	23,650		—		23,650		—
Corporate bonds	4,504		—		4,504		—
Liabilities:
Natural gas futures contracts(2)	107		—		107		—
Contingent consideration obligation(3)	1,516		—		—		1,516
Series I warrants(4)	8,102		—		—		8,102

Description	Balance at March 31, 2013		Level 1		Level 2		Level 3
Assets:
Available-for-sale securities(1):
Certificate of deposits	$	10,062	$	—	$	10,062	$	—
Municipal bonds and notes	23,540		—		23,540		—
Zero coupon bonds	124		—		124		—
Corporate bonds	4,240		—		4,240		—
Liabilities:
Natural gas futures contracts(2)	2		—		2		—
Contingent consideration obligation(3)	1,516		—		—		1,516
Series I warrants(4)	8,568		—		—		8,568

(1) Included in short-term investments in the condensed consolidated balance sheets. See note 4 for further information.

(2) See note 5 for further information.

(3) The current portion is included in accrued liabilities, and the long-term portion is included in other long-term liabilities in the condensed consolidated balance sheets.

(4) Included in other long-term liabilities in the condensed consolidated balance sheets.

Reconciliation of the beginning and ending balances of items measured at fair value on a recurring basis that used significant unobservable inputs (Level 3)

Liabilities: Contingent Consideration	March 31, 2012			March 31, 2013
Beginning Balance	$	5,978		$	1,516
Total gain included in SG&A expense	(2,648		)	—
Ending Balance	$	3,330		$	1,516

Liabilities: Series I Warrants	March 31, 2012		March 31, 2013
Beginning Balance	$	11,493	$	8,102
Total loss included in earnings	13,506		466
Ending Balance	$	24,999	$	8,568

Level 3 | Contingent consideration obligation

Valuation processes for Level 3 Fair Value Measurements

Schedule of fair value measurements of liabilities which fall within level 3 of the fair value hierarchy

Unobservable Input		Range or Weighted Average
Gross profit projection		$16,321–$32,641
Probability of reaching target gross profit		0.0%–40.0%

Level 3 | Series I Warrant

Valuation processes for Level 3 Fair Value Measurements

Schedule of fair value measurements of liabilities which fall within level 3 of the fair value hierarchy

Unobservable Input		Range or Weighted Average
Current market price of the Company’s common stock		$13.00
Exercise price of the warrant		$12.68
Dividend yield		0.00%
Remaining term of the warrant		3.08
Implied volatility of the Company’s common stock		43.2%–46.5%
Assumed discount rate		Simple average 0.4%

- Definition

Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by 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 (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3).

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- 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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