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Equity (Tables)
 6 Months Ended
Jun. 30, 2016
Stockholders' Equity Note [Abstract]  
Summary of changes in equity
The following summarizes the changes in equity for the six months ended June 30, 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
—

 
—

 
435,377

 
—

 
435,377

Loss on cash flow hedges
—

 
—

 
—

 
(74,545
)
 
(74,545
)
Cash flow hedge loss reclassified to earnings
—

 
—

 
—

 
2,935

 
2,935

Change in redemption value of redeemable noncontrolling interest
—

 
—

 
(375
)
 
—

 
(375
)
Dividends declared to common stockholders
—

 
—

 
(370,533
)
 
—

 
(370,533
)
Issuance of common stock, net of withholdings
3

 
9,719

 
(1,288
)
 
—

 
8,434

Amortization of deferred compensation
—

 
14,700

 
—

 
—

 
14,700

Balance at June 30, 2016
$
1,373

 
$
10,092,951

 
$
(134,808
)
 
$
(102,997
)
 
$
9,856,519