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Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 2013
Fair Value Disclosures [Abstract]  
Schedule of assets and liabilities measured at fair value on recurring basis
Assets and liabilities measured at fair value are based the valuation techniques identified in the table below. The valuation techniques are:
(a)
Market approach—prices and other relevant information generated by market transactions involving identical or comparable assets.
(b)
The valuations of the interest rate swaps intended to mitigate the Company’s interest rate risk are determined with the assistance of a third-party financial institution using widely accepted valuation techniques, including discounted cash flow analysis on the expected cash flows of each instrument. This analysis utilizes observable market-based inputs, including interest rate curves and interest rate volatility, and reflects the contractual terms of these instruments, including the period to maturity.
(c)
The valuations of foreign currency forward contracts are determined using widely accepted valuation techniques, including discounted cash flow analysis on the expected cash flows of each instrument. This analysis utilizes observable market-based inputs, including commodity forward curves, and reflects the contractual terms of these instruments, including the period to maturity.
The following tables present financial assets at December 31, 2013 and December 31, 2012 for which the Company measures fair value on a recurring basis, by level, within the fair value hierarchy:
 
December 31, 2013
Total
 
Level 1
 
Level 2
 
Level 3
 
Valuation
Technique
Assets
 
 
 
 
 
 
 
 
 
Money market mutual funds
$
19,957

 
$
19,957

 
$
—

 
$
—

 
(a)
Government agency bonds
8,041

 
8,041

 
—

 
—

 
(a)
United States treasuries
7,509

 
7,509

 
—

 
—

 
(a)
Corporate notes
8,453

 
8,453

 
—

 
—

 
(a)
Certificates of deposit
2,426

 
2,426

 
—

 
—

 
(a)
Foreign currency forward contracts
114

 
—

 
114

 
—

 
(c)
Liabilities
 
 
 
 
 
 
 
 
 
Interest rate swaps
$
332

 
$
—

 
$
332

 
$
—

 
(b)
December 31, 2012
Total
 
Level 1
 
Level 2
 
Level 3
 
Valuation
Technique
Assets
 
 
 
 
 
 
 
 
 
Money market mutual funds
$
9,921

 
$
9,921

 
$
—

 
$
—

 
(a)
Government agency bonds
6,818

 
6,818

 
—

 
—

 
(a)
United States treasuries
6,089

 
6,089

 
—

 
—

 
(a)
Corporate notes
4,679

 
4,679

 
—

 
—

 
(a)
Certificates of deposit
1,800

 
1,800

 
—

 
—

 
(a)
Liabilities
 
 
 
 
 
 
 
 
 
Interest rate swaps
$
542

 
$
—

 
$
542

 
$
—

 
(b)