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Financial Instruments and Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 2016
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, 2016

 

 

December 31, 2015

 

 

Carrying

Amount

 

 

Fair

Value

 

 

Carrying

Amount

 

 

Fair

Value

 

Senior Notes

$

2,913,217

 

 

$

3,056,896

 

 

$

3,149,188

 

 

$

3,292,723

 

Revolving Credit Facilities and term loans

 

598,242

 

 

 

601,131

 

 

 

807,185

 

 

 

811,666

 

Mortgage Indebtedness

 

982,509

 

 

 

1,012,869

 

 

 

1,183,164

 

 

 

1,235,139

 

 

$

4,493,968

 

 

$

4,670,896

 

 

$

5,139,537

 

 

$

5,339,528