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Fair Value Measurements Fair Value Measurements (Tables)
 9 Months Ended
Sep. 30, 2017
Fair Value Disclosures [Abstract]  
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Table Text Block]
The following table summarizes the levels of fair value measurements of our financial assets:

 
 
Fair Value Measurements
 
 
(in thousands)
 
 
September 30,
2017
 
Level 1
 
Level 2
 
Level 3
 
 
 
 
 
 
 
 
 
Money market funds
 
$
276,392

 
$
276,392

 
$
—

 
$
—

Municipal bonds
 
1,950

 
—

 
1,950

 
—

Total
 
$
278,342

 
$
276,392

 
$
1,950

 
$
—

 
 
 
Fair Value Measurements
 
 
(in thousands)
 
 
December 31,
2016
 
Level 1
 
Level 2
 
Level 3
 
 
 
 
 
 
 
 
 
Money market funds
 
$
283,322

 
$
283,322

 
$
—

 
$
—

Municipal bonds
 
1,851

 
—

 
1,851

 
—

Total
 
$
285,173

 
$
283,322

 
$
1,851

 
$
—