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Fair Value Measurements Fair Value Measurements (Notes)
6 Months Ended
Jun. 30, 2018
Fair Value Disclosures [Abstract]  
Fair Value Disclosures [Text Block]
4.
Fair Value Measurements

We account for our financial assets in accordance with Accounting Standard Codification 820, Fair Value Measurement. This standard defines fair value, establishes a framework for measuring fair value and expands disclosures about fair value measurements. The fair value measurement disclosures are grouped into three levels based on valuation factors:

Level 1 - quoted prices in active markets using identical assets
Level 2 - significant other observable inputs, such as quoted prices for similar assets or liabilities, quoted prices in markets that are not active, or other observable inputs
Level 3 - significant unobservable inputs

Fair Value of Instruments Measured and Recognized at Fair Value

The following tables summarize the levels of fair value measurements of our financial assets:

 
 
Fair Value Measurements
 
 
(in thousands)
 
 
June 30,
2018
 
Level 1
 
Level 2
 
Level 3
 
 
 
 
 
 
 
 
 
Money market funds
 
$
299,691

 
$
299,691

 
$

 
$

Municipal bonds
 
7,207

 

 
7,207

 

Total
 
$
306,898

 
$
299,691

 
$
7,207

 
$

 
 
 
Fair Value Measurements
 
 
(in thousands)
 
 
December 31,
2017
 
Level 1
 
Level 2
 
Level 3
 
 
 
 
 
 
 
 
 
Money market funds
 
$
360,746

 
$
360,746

 
$

 
$

Municipal bonds
 
1,960

 

 
1,960

 

Total
 
$
362,706

 
$
360,746

 
$
1,960

 
$



The municipal bond securities valued as Level 2 investments are primarily pre-refunded municipal bonds that are secured by escrow funds containing U.S. government securities. Our valuation techniques used to measure fair value for these securities during the period consisted primarily of third party pricing services that utilized actual market data such as trades of comparable bond issues, broker/dealer quotations for the same or similar investments in active markets and other observable inputs.

Fair Value of Other Financial Instruments

The carrying amounts of cash, cash equivalents, restricted cash, accounts receivable, deposits and accounts payable approximate their fair values due to the short-term maturities of these instruments.

As of June 30, 2018, the carrying value of our borrowings under our revolving credit facility approximates fair value and was classified as Level 2 in the fair value hierarchy. Please read Note 5, “Long-Term Debt,” for additional information.