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Fair Value Of Instruments (Tables)
 3 Months Ended
Mar. 31, 2015
Fair Value Disclosures [Abstract]  
Estimated Fair Value And Carrying Amounts
As of March 31, 2015 and December 31, 2014, the aggregate estimated fair value and carrying value of our global revolving credit facility, unsecured term loan, unsecured senior notes, exchangeable senior debentures and mortgage loans were as follows (in thousands):
 
Categorization
under the fair value
hierarchy
 
As of March 31, 2015
 
As of December 31, 2014
 
Estimated Fair Value
 
Carrying Value
 
Estimated Fair Value
 
Carrying Value
Global revolving credit facility (1)
Level 2
 
$
826,906

 
$
826,906

 
$
525,951

 
$
525,951

Unsecured term loan (2)
Level 2
 
942,006

 
942,006

 
976,600

 
976,600

Unsecured senior notes (3)(4)
Level 2
 
2,894,846

 
2,672,472

 
2,968,073

 
2,791,758

Mortgage loans (3)
Level 2
 
397,050

 
376,527

 
399,569

 
378,818

 
 
 
$
5,060,808

 
$
4,817,911

 
$
4,870,193

 
$
4,673,127

 
(1)
The carrying value of our global revolving credit facility approximates estimated fair value, due to the variability of interest rates and the stability of our credit ratings.
(2)
The carrying value of our unsecured term loan approximates estimated fair value, due to the variability of interest rates and the stability of our credit ratings.
(3)
Valuations for our unsecured senior notes and mortgage loans are determined based on the expected future payments discounted at risk-adjusted rates. The 2015 Notes, 2020 Notes, 2021 Notes, 2022 Notes, 2023 Notes and 2025 Notes are valued based on quoted market prices.
(4)
The carrying value of the 2015 Notes, 2020 Notes, 2021 Notes, 2022 Notes, 2023 Notes and 2025 Notes are net of discount of $14,788 and $15,632 in the aggregate as of March 31, 2015 and December 31, 2014, respectively.