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Equity (Tables)
9 Months Ended
Sep. 30, 2018
Stockholders' Equity Note [Abstract]  
Summary of changes in equity
The following summarizes the changes in equity for the nine months ended September 30, 2018 (dollars in thousands):
 
Common
stock
 
Additional
paid-in
capital
 
Accumulated
earnings
less
dividends
 
Accumulated
other
comprehensive
loss
 
Total
equity
 
 
 
 
 
 
 
 
 
 
Balance at December 31, 2017
$
1,381

 
$
10,235,475

 
$
188,609

 
$
(37,419
)
 
$
10,388,046

Net income attributable to common stockholders

 

 
588,791

 

 
588,791

Gain on cash flow hedges, net

 

 

 
11,499

 
11,499

Cash flow hedge losses reclassified to earnings

 

 

 
4,679

 
4,679

Change in redemption value of redeemable noncontrolling interest

 

 
(626
)
 

 
(626
)
Dividends declared to common stockholders

 

 
(609,972
)
 

 
(609,972
)
Issuance of common stock, net of withholdings
1

 
(11,217
)
 
1,144

 

 
(10,072
)
Amortization of deferred compensation

 
25,053

 

 

 
25,053

Balance at September 30, 2018
$
1,382

 
$
10,249,311

 
$
167,946

 
$
(21,241
)
 
$
10,397,398