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Financial Instruments and Marketable Securities
 3 Months Ended
Mar. 31, 2014
Financial Instruments and Marketable Securities [Abstract]  
Financial Instruments and Marketable Securities
(2) Financial Instruments and Marketable Securities
Due to the varying short-term cash needs of our business, we periodically have marketable securities. We value these assets utilizing a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets and liabilities (Level 1) and the lowest priority to measurements involving unobservable inputs (Level 3). The three levels of the fair value hierarchy and how they are determined are defined in our 2013 annual report on Form 10-K in Note 1 of the Notes to Consolidated Financial Statements.
 
The following table presents the placement in the fair value hierarchy of assets that are measured at fair value on a recurring basis:
 
March 31, 2014:
Total
 
Level 1
 
Level 2
 
Level 3
Common stock
$
453

 
453

 
—

 
—

Total available-for-sale securities
$
453

 
453

 
—

 
—

 
December 31, 2013:
Total
 
Level 1
 
Level 2
 
Level 3
Common stock
$
451

 
451

 
—

 
—

Total available-for-sale securities
$
451

 
451

 
—

 
—

 
March 31, 2013:
Total
 
Level 1
 
Level 2
 
Level 3
Common stock
$
417

 
417

 
—

 
—

Total available-for-sale securities
$
417

 
417

 
—

 
—


There were no transfers between levels during the three month periods ended March 31, 2014 and 2013.
As of March 31, 2014, December 31, 2013, and March 31, 2013, our financial assets that are measured at fair value on a recurring basis consisted of common stock.

Marketable securities, all treated as available-for-sale securities, consist of the following:
 
March 31, 2014:
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair Value
Common stock
$
197

 
256

 
—

 
453

Total available-for-sale securities
$
197

 
256

 
—

 
453

 
December 31, 2013:
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair Value
Common stock
$
197

 
254

 
—

 
451

Total available-for-sale securities
$
197

 
254

 
—

 
451

 
March 31, 2013:
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair Value
Common stock
$
197

 
220

 
—

 
417

Total available-for-sale securities
$
197

 
220

 
—

 
417


The unrealized gains and losses recorded in accumulated other comprehensive income and the realized gains and losses recorded in earnings were immaterial during the periods reported in these consolidated financial statements.
Future maturities of our available-for-sale securities consist of the following:
 
 
Less than 12 Months
 
Greater than 12 Months
March 31, 2014:
Amortized
Cost
 
Fair
Value
 
Amortized
Cost
 
Fair
Value
Common stock
$
197

 
453

 
—

 
—

Total available-for-sale securities
$
197

 
453

 
—

 
—