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Fair Value of Financial Instruments:
3 Months Ended
Mar. 31, 2019
Fair Value Disclosures [Abstract]  
Fair Value of Financial Instruments FAIR VALUE OF FINANCIAL INSTRUMENTS

The estimated fair values of our financial instruments, excluding derivatives which are presented in Note 11, were as follows (in thousands) as of:
 
March 31, 2019
 
December 31, 2018
 
March 31, 2018
 
Carrying
Amount
Fair Value
 
Carrying
Amount
Fair Value
 
Carrying
Amount
Fair Value
Cash and cash equivalents (a)
$
12,225

$
12,225

 
$
20,776

$
20,776

 
$
30,947

$
30,947

Restricted cash (a)
$
3,494

$
3,494

 
$
3,369

$
3,369

 
$
2,958

$
2,958

Notes payable (b)
$
164,650

$
164,650

 
$
185,620

$
185,620

 
$
164,200

$
164,200

Long-term debt, including current maturities (c) (d)
$
2,956,042

$
3,137,538

 
$
2,956,578

$
3,039,108

 
$
3,114,530

$
3,265,965

__________
(a)
Carrying value approximates fair value due to either the short-term length of maturity or variable interest rates that approximate prevailing market rates, and therefore is classified in Level 1 in the fair value hierarchy.
(b)
Notes payable consist of commercial paper borrowings and borrowings on our Revolving Credit Facility. Carrying value approximates fair value due to the short-term length of maturity; since these borrowings are not traded on an exchange, they are classified in Level 2 in the fair value hierarchy.
(c)
Long-term debt is valued based on observable inputs available either directly or indirectly for similar liabilities in active markets and therefore is classified in Level 2 in the fair value hierarchy.
(d)
Carrying amount of long-term debt is net of deferred financing costs.