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Senior Notes and Unsecured Revolving Credit Facility (Tables)
12 Months Ended
Dec. 31, 2018
Debt Disclosure [Abstract]  
Schedule of Senior Notes
Senior notes consisted of the following (in thousands): 
 
December 31,
2018
 
December 31,
2017
4.375% Senior Notes due June 15, 2019
$
381,895

 
$
450,000

4.875% Senior Notes due July 1, 2021
300,000

 
300,000

5.875% Senior Notes due June 15, 2024
450,000

 
450,000

5.250% Senior Notes due June 1, 2027
300,000

 
300,000

Discount and deferred loan costs
(21,091
)
 
(28,698
)
Total
$
1,410,804

 
$
1,471,302