Fair Value Measurements

3 Months Ended

Mar. 31, 2014

Fair Value Measurements [Abstract]

Fair Value Measurements

(4) Fair Value Measurements

Our financial instruments include cash and cash equivalents, accounts receivable, non‑marketable securities, accounts payable, notes payable and certain accrued liabilities.  The carrying amounts of our cash and cash equivalents (which are comprised primarily of deposit and overnight sweep accounts), accounts receivable, accounts payable, and certain accrued liabilities approximate fair value due to the short maturity of these instruments.  The estimated fair values of the non-marketable equity securities have been determined from information obtained from independent valuations and management estimates.  The carrying value of our long-term debt recognized in the consolidated balance sheets as of March 31, 2014 and December 31, 2013, was approximately $228,016 and $236,432, respectively, while the fair value of long-term debt as of March 31, 2014 and December 31, 2013, was approximately $225,530 and $226,789, respectively, based on Level 2 inputs consisting of quoted market prices for the same issues.  See Note 6 for further discussion of our debt.

Non-Current Investments

At March 31, 2014 and December 31, 2013, we held equity securities in two private companies, which are classified within other assets in our condensed consolidated balance sheets.  The investments in these equity securities are classified as Level 3 investments and are accounted for using the equity method of accounting.  Any losses due to impairment in value are recorded as realized losses when such losses occur.  The carrying value of these Level 3 investments at March 31, 2014 and December 31, 2013, is $453.