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Income Taxes (Tables)
 12 Months Ended
Dec. 31, 2014
Income Tax Disclosure [Abstract]  
Provision (Benefit) for Income Taxes
The provision (benefit) for income taxes for the years ended December 31, 2014, 2013 and 2012, consisted of the following (in thousands):
 
 
 
Years Ended December 31,
 
 
2014
 
2013
 
2012
Current:
 
 
 
 
 
 
Federal
 
$
146,633

 
$
114,687

 
$
99,354

State
 
33,054

 
27,358

 
24,339

Foreign
 
15,377

 
16,598

 
25,603

Deferred:
 
 
 
 
 
 
Federal and state
 
(4,626
)
 
(7,759
)
 
(15,188
)
Foreign
 
983

 
(5,500
)
 
195

 
 
$
191,421

 
$
145,384

 
$
134,303
Income Before Provision for Income Taxes
Income before the provision for income taxes for the years ended December 31, 2014, 2013 and 2012, consisted of the following (in thousands):
 
 
 
Years Ended December 31,
 
 
2014
 
2013
 
2012
Domestic
 
$
449,834

 
$
357,382

 
$
286,537

Foreign
 
47,515

 
40,197

 
57,708

 
 
$
497,349

 
$
397,579

 
$
344,245
Difference of Income Taxes from Statutory Federal Income Tax Rates
The income taxes shown above varied from the statutory federal income tax rates for these periods as follows:
 
 
 
Years Ended December 31,
 
 
2014
 
2013
 
2012
Federal U.S. income tax rate
 
35.0
 %
 
35.0
 %
 
35.0
 %
State income taxes, net of federal tax benefit
 
4.2

 
4.3

 
4.0

Non-deductible expenses
 
0.6

 
0.7

 
0.8

Non-U.S. income taxed at different rates, net of foreign tax
credits
 
(0.2
)
 
(1.0
)
 
0.7

Federal tax credits
 
(0.6
)
 
(1.3
)
 
(0.3
)
Tax impact of uncertain tax positions
 
(0.1
)
 
0.1

 
(1.2
)
Valuation allowance release, net
 
(0.3
)
 
(1.0
)
 
—

Other, net
 
(0.1
)
 
(0.2
)
 
—

Effective tax rate
 
38.5
 %
 
36.6
 %
 
39.0
 %
Deferred Portion of Tax Provision (Benefit)
The deferred portion of the tax provision (benefit) consisted of the following (in thousands):
 
 
 
Years Ended December 31,
 
 
2014
 
2013
 
2012
Amortization of franchise rights
 
$
514

 
$
514

 
$
514

Amortization of other intangibles
 
1,241

 
621

 
1,180

Accrued expenses, deducted for tax when paid
 
(14,221
)
 
(11,190
)
 
(13,494
)
Capitalized costs for books, deducted for tax
 
8,809

 
3,019

 
7,395

Depreciation
 
(4,147
)
 
(2,597
)
 
(7,813
)
Federal impact of unrecognized tax benefits
 
44

 
(274
)
 
478

Foreign tax credit carryforwards
 
(186
)
 
(3,449
)
 
—

Other, net
 
4,303

 
97

 
(3,253
)
 
 
$
(3,643
)
 
$
(13,259
)
 
$
(14,993
)
Deferred Income Tax Amounts Included on Consolidated Statements of Financial Position
The deferred income tax amounts included on the Consolidated Statements of Financial Position are composed of the following (in thousands):
 
 
 
December 31,
 
 
2014
 
2013
Current deferred income tax assets, net
 
$
133,151

 
$
112,881

Long-term deferred income tax liabilities, net
 
(26,807
)
 
(10,601
)
 
 
$
106,344

 
$
102,280
Components of Deferred Income Tax Amounts
The components of the deferred income tax amounts at December 31, 2014 and 2013, were as follows (in thousands):
 
 
 
December 31,
 
 
2014
 
2013
Deferred Income Tax Assets
 
 
 
 
Provision for bad debts
 
$
9,210

 
$
8,012

Deferred compensation and other benefit obligations
 
83,065

 
72,227

Workers’ compensation
 
9,138

 
9,538

Stock-based compensation
 
14,572

 
12,067

Credits and net operating loss carryforwards
 
39,309

 
49,556

Other
 
25,316

 
25,953

Total deferred income tax assets
 
180,610

 
177,353

Deferred Income Tax Liabilities
 
 
 
 
Amortization of intangible assets
 
(25,060
)
 
(23,305
)
Property and equipment basis differences
 
(12,384
)
 
(8,098
)
Other
 
(7,261
)
 
(6,626
)
Total deferred income tax liabilities
 
(44,705
)
 
(38,029
)
Valuation allowance
 
(29,561
)
 
(37,044
)
Total deferred income tax assets, net
 
$
106,344

 
$
102,280
Reconciliation of Total Amounts of Gross Unrecognized Tax Benefits
The following table reconciles the total amounts of gross unrecognized tax benefits from January 1, 2012 to December 31, 2014 (in thousands):
 
 
 
December 31,
 
 
2014
 
2013
 
2012
Balance at beginning of period
 
$
6,110

 
$
7,097

 
$
11,669

Gross increases—tax positions in prior years
 
1

 
559

 
352

Gross decreases—tax positions in prior years
 
(333
)
 
(369
)
 
(273
)
Gross increases—tax positions in current year
 
35

 
38

 
42

Settlements
 
—

 
—

 
(252
)
Lapse of statute of limitations
 
(1,240
)
 
(1,215
)
 
(4,441
)
Balance at end of period
 
$
4,573

 
$
6,110

 
$
7,097