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Fair Value Measurements
9 Months Ended
Sep. 30, 2015
Fair Value Disclosures [Abstract]  
Fair Value Measurements
16.    Fair Value Measurements

The accounting framework for determining fair value includes a hierarchy for ranking the quality and reliability of the information used to measure fair value, which enables the reader of the financial statements to assess the inputs used to develop those measurements. The fair value hierarchy consists of three tiers as follows: Level 1, defined as quoted market prices in active markets for identical assets or liabilities; Level 2, defined as inputs other than Level 1 that are observable, either directly or indirectly, such as quoted prices for similar assets or liabilities, quoted prices in markets that are not active, model-based valuation techniques for which all significant assumptions are observable in the market or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities and Level 3, defined as unobservable inputs that are not corroborated by market data.

The fair values of cash, accounts receivable, trade accounts payable, capital expenditures payable, and certain other current assets and accrued expenses approximate carrying values because of their short-term nature. The carrying value of other non-current liabilities approximates fair value. Our assets and liabilities recorded at fair value on a recurring basis include cash equivalent money market funds and restricted cash money market funds. Cash equivalent money market funds and restricted cash money market funds are invested in U.S. money market funds and various U.S. and foreign bank operating and time deposit accounts, which are due on demand or carry a maturity date of less than three months when purchased. No restrictions have been imposed on us regarding withdrawal of balances with respect to our cash equivalents as a result of liquidity or other credit market issues affecting the money market funds we invest in or the counterparty financial institutions holding our deposits. Money market funds are valued using quoted market prices in active markets for identical assets.

Our recurring fair value measurements consist of the following:
 
September 30,
2015
 
December 31,
2014
 
(In thousands)
Cash equivalent money market funds (Level 1)
$
131,451

 
$
145,938

Restricted cash money market funds (Level 1)
2,000

 
2,681


We also measure certain assets and liabilities, including property, plant and equipment and our investment in J-Devices, at fair value on a nonrecurring basis.

We measure the fair value of our debt for disclosure purposes. The following table presents the fair value of financial instruments that are not recorded at fair value on a recurring basis:
 
September 30, 2015
 
December 31, 2014
 
Fair
Value
 
Carrying
Value
 
Fair
Value
 
Carrying
Value
 
(In thousands)
Senior notes (Level 1)
$
872,202

 
$
930,376

 
$
1,268,619

 
$
1,275,824

Revolving credit facility and term loans (Level 2)
509,075

 
510,000

 
254,999

 
255,000

Total debt
$
1,381,277

 
$
1,440,376

 
$
1,523,618

 
$
1,530,824



The estimated fair value of our senior notes is based primarily on quoted market prices reported on or near the respective balance sheet dates. The estimated fair value of our revolving credit facility and term loans was calculated using a discounted cash flow analysis, which utilized market based assumptions including forward interest rates adjusted for credit risk.