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Equity (Tables)
3 Months Ended
Mar. 31, 2016
Stockholders' Equity Note [Abstract]  
Summary of changes in equity
The following summarizes the changes in equity for the three months ended March 31, 2016 (dollars in thousands):
 
Common
stock
 
Additional
paid-in
capital
 
Accumulated
earnings
less
dividends
 
Accumulated
other
comprehensive
loss
 
Total
equity
 
 
 
 
 
 
 
 
 
 
Balance at December 31, 2015
$
1,370

 
$
10,068,532

 
$
(197,989
)
 
$
(31,387
)
 
$
9,840,526

Net income attributable to common stockholders

 

 
237,931

 

 
237,931

Unrealized loss on cash flow hedges

 

 

 
(47,757
)
 
(47,757
)
Cash flow hedge loss reclassified to earnings

 

 

 
1,374

 
1,374

Change in redemption value of redeemable noncontrolling interest

 

 
(299
)
 

 
(299
)
Dividends declared to common stockholders

 

 
(185,168
)
 

 
(185,168
)
Issuance of common stock, net of withholdings
2

 
(5,747
)
 
(1,274
)
 

 
(7,019
)
Amortization of deferred compensation

 
6,944

 

 

 
6,944

Balance at March 31, 2016
$
1,372

 
$
10,069,729

 
$
(146,799
)
 
$
(77,770
)
 
$
9,846,532