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Financial Instruments and Fair Value Measurements (Tables)
12 Months Ended
Dec. 31, 2018
Fair Value Disclosures [Abstract]  
Debt Instruments with Carrying Values Different than Estimated Fair Values

Debt instruments with carrying values that are different than estimated fair values are summarized as follows (in thousands):

 

 

December 31, 2018

 

 

December 31, 2017

 

 

Carrying

Amount

 

 

Fair

Value

 

 

Carrying

Amount

 

 

Fair

Value

 

Senior Notes

$

1,646,007

 

 

$

1,639,827

 

 

$

2,810,100

 

 

$

2,884,272

 

Revolving Credit Facilities and term loans

 

149,655

 

 

 

150,533

 

 

 

398,130

 

 

 

400,119

 

Mortgage Indebtedness

 

88,743

 

 

 

89,228

 

 

 

641,082

 

 

 

653,185

 

 

$

1,884,405

 

 

$

1,879,588

 

 

$

3,849,312

 

 

$

3,937,576