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Fair Value Measurements (Tables)
 6 Months Ended
Jun. 30, 2017
Fair Value Disclosures [Abstract]  
Estimated Fair Values of Other Financial Instruments

The estimated fair values of other financial instruments subject to fair value disclosures, determined based on Level One inputs including broker quotes or quoted market prices or rates for the same or similar instruments and the related carrying amounts are as follows:

 

 

 

June 30, 2017

 

 

December 31, 2016

 

 

 

Carrying Amount

 

 

Fair Value

 

 

Carrying Amount

 

 

Fair Value

 

Long-term debt, including current portion(1)

 

$

961,957

 

 

$

937,493

 

 

$

1,254,160

 

 

$

1,228,324

 

 

(1)

Carrying amounts include aggregate unamortized debt discount and debt issuance costs.