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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