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Other Comprehensive (Loss) Income (Tables)
 12 Months Ended
Dec. 31, 2017
Statement of Comprehensive Income [Abstract]  
Changes in Other Comprehensive (Loss) Income
Charges and credits to other comprehensive (loss) income have been as follows: 
 
Interest rate
cap and swap
agreements
 
Investment
securities
 
Foreign
currency
translation
adjustments
 
Accumulated
other
comprehensive
(loss) income
Balance at January 1, 2015
$
(1,795
)
 
$
3,151

 
$
(26,373
)
 
$
(25,017
)
Unrealized losses
(20,085
)
 
(1,974
)
 
(23,889
)
 
(45,948
)
Related income tax
7,844

 
561

 
—

 
8,405

 
(12,241
)
 
(1,413
)
 
(23,889
)
 
(37,543
)
Reclassification from accumulated other comprehensive losses
(income) into net income
5,103

 
(618
)
 
—

 
4,485

Related income tax
(1,992
)
 
241

 
—

 
(1,751
)
 
3,111

 
(377
)
 
—

 
2,734

Balance at December 31, 2015
$
(10,925
)
 
$
1,361

 
$
(50,262
)
 
$
(59,826
)
Unrealized (losses) gains
(6,013
)
 
1,802

 
(39,614
)
 
(43,825
)
Related income tax
2,343

 
(565
)
 
—

 
1,778

 
(3,670
)
 
1,237

 
(39,614
)
 
(42,047
)
Reclassification from accumulated other comprehensive losses
(income) into net income
4,198

 
(690
)
 
10,087

 
13,595

Related income tax
(1,632
)
 
267

 
—

 
(1,365
)
 
2,566

 
(423
)
 
10,087

 
12,230

Balance at December 31, 2016
$
(12,029
)
 
$
2,175

 
$
(79,789
)
 
$
(89,643
)
Unrealized (losses) gains
(8,897
)
 
5,075

 
99,770

 
95,948

Related income tax
3,460

 
(1,368
)
 
—

 
2,092

 
(5,437
)
 
3,707

 
99,770

 
98,040

Reclassification from accumulated other comprehensive losses
(income) into net income
8,278

 
(360
)
 
—

 
7,918

Related income tax
(3,220
)
 
140

 
—

 
(3,080
)
 
5,058

 
(220
)
 
—

 
4,838

Balance at December 31, 2017
$
(12,408
)
 
$
5,662

 
$
19,981

 
$
13,235