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Fair Value Measurements
6 Months Ended
Jun. 30, 2017
Fair Value Disclosures [Abstract]  
Fair Value Measurements
Fair Value Measurements

Assets and Liabilities Measured at Fair Value on a Recurring Basis

The fair value of accounts receivable, accounts payable and accrued liabilities, to the extent the underlying liability will be settled in cash, approximates the carrying values because of the short-term nature of these instruments.

Cash Equivalents

Cash equivalents, when held, primarily consist of money market accounts which are classified as Level 1 assets which the Company measures at fair value on a recurring basis. The Company determines the fair value of cash equivalents using a market approach based on quoted prices in active markets. The Company had no cash equivalents at June 30, 2017 or December 31, 2016.

Financial Instruments

The fair value of the Company's financial instruments as of June 30, 2017 and December 31, 2016 are shown in Note 11, "Financial Instruments." The Company's financial instruments are classified as Level 2 assets and liabilities and are priced using quoted market prices for similar assets or liabilities in active markets.

Debt Obligations

The fair value of debt is estimated based on quoted market rates as well as borrowing rates currently available to the Company for loans with similar terms and average maturities (Level 2 inputs) (in millions).
 
June 30, 2017
 
December 31, 2016
 
Nominal Unpaid Principal Balance
 
Aggregate Fair Value
 
Nominal Unpaid Principal Balance
 
Aggregate Fair Value
Debt
$
2,179.1

 
$
2,237.5

 
$
2,215.3

 
$
2,275.5