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Income Taxes (Tables)
12 Months Ended
Dec. 31, 2015
Income Tax Disclosure [Abstract]  
Schedule of Federal and State and Foreign Income Tax Provision
The federal and state and foreign income tax provision is summarized as follows: 
Year Ended December 31,
 
2015
 
2014
 
2013
Current
 
 
 
 
 
 
Federal
 
$
159,774

 
$
155,273

 
$
153,856

State
 
7,756

 
8,744

 
11,542

Foreign
 
5,224

 
5,254

 
4,727

 
 
172,754

 
169,271

 
170,125

Deferred, including current deferred
 
 
 
 
 
 
Federal
 
(5,343
)
 
1,667

 
(2,214
)
State
 
1,414

 
11

 
(16,264
)
Foreign
 

 

 
(4,814
)
 
 
(3,929
)
 
1,678

 
(23,292
)
Income taxes attributable to the noncontrolling interest
 

 

 
91

Total income taxes
 
$
168,825

 
$
170,949

 
$
146,924

Components of Net Income Before Income Taxes
The components of Income before income taxes are summarized as follows:
Year Ended December 31,
 
2015
 
2014
 
2013
Domestic
 
$
472,384

 
$
475,175

 
$
427,915

Foreign
 
28,096

 
14,487

 
7,042

 
 
$
500,480

 
$
489,662

 
$
434,957

Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate
The effective income tax rate differs from the federal income tax statutory rate due to the following:
Year Ended December 31,
2015
 
2014
 
2013
Statutory rate
35.0
 %
 
35.0
 %
 
35.0
 %
State taxes, net of federal tax benefit
1.6

 
1.2

 
1.5

Foreign tax expense and tax rate differential
(1.2
)
 
(0.7
)
 
0.5

Research and development tax credit
(0.6
)
 
(0.4
)
 
(0.8
)
Domestic Production Activities Deduction
(0.6
)
 
(0.4
)
 
(0.5
)
PA Tax Law changes and change in valuation allowance on loss carryforwards

 

 
(2.4
)
Net change in uncertain tax positions

 
0.3

 
0.1

Settlement of state tax petition
(0.8
)
 

 

Other, net
0.3

 
(0.1
)
 
0.3

 
33.7
 %
 
34.9
 %
 
33.7
 %
Schedule of Deferred Tax Assets and Liabilities
The net deferred income tax liability is comprised of:
Year Ended December 31,
 
2015
 
2014
Deferred income taxes:
 
 
 
 
Gross assets
 
70,106

 
69,287

Gross liabilities
 
(118,586
)
 
(117,947
)
 
 
(48,480
)
 
(48,660
)
Valuation allowance
 
(14,548
)
 
(16,509
)
Net deferred income tax liability
 
$
(63,028
)
 
$
(65,169
)
Schedule of Temporary Differences Representing Net Deferred Tax Assets or Liabilities
The tax effect of significant temporary differences representing deferred tax liabilities is:
Year Ended December 31,
 
2015
 
2014
Difference in financial reporting and income tax depreciation methods
 
$
(2,695
)
 
$
(3,637
)
Reserves not currently deductible
 
245

 
209

Capitalized software currently deductible for tax purposes, net of amortization
 
(111,174
)
 
(118,841
)
State deferred income taxes
 
1,444

 
(420
)
Revenue and expense recognized in different periods for financial reporting and income tax purposes
 
5,534

 
6,212

Unrealized holding loss (gain) on investments
 
772

 
(475
)
Stock-based compensation expense
 
34,739

 
38,989

State net operating loss carryforward
 
19,580

 
24,150

Valuation allowance on deferred tax assets
 
(14,548
)
 
(16,509
)
Federal benefit of state tax deduction for uncertain tax positions
 
3,014

 
2,913

Foreign tax credit
 

 
2,327

Foreign deferred
61

 
(87
)
Net deferred income tax liability
 
$
(63,028
)
 
$
(65,169
)
Schedule of Unrecognized Tax Benefits Roll Forward
A reconciliation of the beginning and ending amount of unrecognized tax benefit is as follows:
 
 
2015
 
2014
 
2013
Balance as of January 1
 
$
14,018

 
$
12,028

 
$
11,553

Tax positions related to current year:
 
 
 
 
 
 
Gross additions
 
1,954

 
1,957

 
1,834

Gross reductions
 

 

 

 
 
1,954

 
1,957

 
1,834

Tax positions related to prior years:
 
 
 
 
 
 
Gross additions
 
297

 
1,369

 
3,435

Gross reductions
 

 

 

 
 
297

 
1,369

 
3,435

Settlements
 

 

 
(3,772
)
Lapses on statute of limitations
 
(1,752
)
 
(1,336
)
 
(1,022
)
Balance as of December 31
 
$
14,517

 
$
14,018

 
$
12,028