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Comprehensive income
 6 Months Ended
Jun. 30, 2017
Statement of Comprehensive Income [Abstract]  
Comprehensive income
Comprehensive income 
 
For the three months ended
June 30, 2017
 
For the six months ended
June 30, 2017
 
Interest
rate cap
agreements
 
Investment
securities
 
Foreign
currency
translation
adjustments
 
Accumulated
other
comprehensive
(loss) income
 
Interest
rate cap
agreements
 
Investment
securities
 
Foreign
currency
translation
adjustments
 
Accumulated
other
comprehensive
(loss) income
Beginning balance
$
(13,952
)
 
$
3,594

 
$
(66,528
)
 
$
(76,886
)
 
$
(12,029
)
 
$
2,175

 
$
(79,789
)
 
$
(89,643
)
Unrealized (losses)
gains
(2,969
)
 
1,446

 
49,142

 
47,619

 
(8,186
)
 
3,428

 
62,403

 
57,645

Related income tax
benefit (expense)
1,154

 
(389
)
 
—

 
765

 
3,184

 
(812
)
 
—

 
2,372

 
(1,815
)
 
1,057

 
49,142

 
48,384

 
(5,002
)
 
2,616

 
62,403

 
60,017

Reclassification
from accumulated
other
comprehensive
income into net
income
2,070

 
(117
)
 
—

 
1,953

 
4,139

 
(346
)
 
—

 
3,793

Related income tax (expense) benefit
(805
)
 
46

 
—

 
(759
)
 
(1,610
)
 
135

 
—

 
(1,475
)
 
1,265

 
(71
)
 
—

 
1,194

 
2,529

 
(211
)
 
—

 
2,318

Ending balance
$
(14,502
)
 
$
4,580

 
$
(17,386
)
 
$
(27,308
)
 
$
(14,502
)
 
$
4,580

 
$
(17,386
)
 
$
(27,308
)

 
For the three months ended
June 30, 2016
 
For the six months ended
June 30, 2016
 
Interest
rate cap
and swap
agreements
 
Investment
securities
 
Foreign
currency
translation
adjustments
 
Accumulated
other
comprehensive
(loss) income
 
Interest
rate cap
and swap
agreements
 
Investment
securities
 
Foreign
currency
translation
adjustments
 
Accumulated
other
comprehensive
(loss) income
Beginning balance
$
(15,929
)
 
$
1,497

 
$
(39,081
)
 
$
(53,513
)
 
$
(10,925
)
 
$
1,361

 
$
(50,262
)
 
$
(59,826
)
Unrealized (losses)
gains
(4,283
)
 
782

 
(4,844
)
 
(8,345
)
 
(13,234
)
 
1,124

 
6,337

 
(5,773
)
Related income tax
benefit (expense)
1,667

 
(293
)
 
—

 
1,374

 
5,149

 
(406
)
 
—

 
4,743

 
(2,616
)
 
489

 
(4,844
)
 
(6,971
)
 
(8,085
)
 
718

 
6,337

 
(1,030
)
Reclassification
from accumulated
other
comprehensive
income into net
income
733

 
—

 
—

 
733

 
1,494

 
(152
)
 
—

 
1,342

Related income tax (expense) benefit
(285
)
 
—

 
—

 
(285
)
 
(581
)
 
59

 
—

 
(522
)
 
448

 
—

 
—

 
448

 
913

 
(93
)
 
—

 
820

Ending balance
$
(18,097
)
 
$
1,986

 
$
(43,925
)
 
$
(60,036
)
 
$
(18,097
)
 
$
1,986

 
$
(43,925
)
 
$
(60,036
)

The reclassification of net cap and swap realized losses into income are recorded as debt expense in the corresponding consolidated statements of income. See Note 9 to these condensed consolidated financial statements for further details.
The reclassification of net investment realized gains into income are recorded in other income in the corresponding consolidated statements of income. See Note 4 to these condensed consolidated financial statements for further details.