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Fair Value Disclosures (Tables)
3 Months Ended
Mar. 31, 2019
Fair Value Disclosures [Abstract]  
Summary of Assets and Liabilities Related to Financial Instruments, Measured at Fair Value on a Recurring Basis
A summary of assets and liabilities at March 31, 2019 and December 31, 2018, related to our financial instruments, measured at fair value on a recurring basis, is set forth below (in thousands):
 
 
 
March 31, 2019
 
December 31, 2018
 
Hierarchy
 
Book Value
 
Fair Value
 
Book Value
 
Fair Value
Senior Notes (1)
Level 2
 
$
1,425,892

 
$
1,395,794

 
$
1,425,397

 
$
1,308,826

 __________
(1) 
The book value of the Senior Notes is net of discounts, excluding deferred loan costs of $13.4 million and $14.6 million as of March 31, 2019 and December 31, 2018, respectively. The estimated fair value of the Senior Notes at March 31, 2019 and December 31, 2018 is based on quoted market prices.