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Income Taxes (Tables)
 12 Months Ended
Dec. 31, 2017
Income Tax Disclosure [Abstract]  
Components of Income (Loss) Before Taxes from Continuing Operations
The components of income (loss) before taxes from continuing operations consisted of the following for the years ended December 31 (in thousands):
 
2017
 
2016
 
2015
Domestic
$
78,468

 
$
37,316

 
$
40,176

Foreign
(560
)
 
12,667

 
(3,076
)
Income before taxes from continuing operations
$
77,908

 
$
49,983

 
$
37,100
Summary of Provision for Income Taxes for Continuing Operations
The provision for (benefit of) income taxes from continuing operations for the years ended December 31 consisted of the following (in thousands):
 
2017
 
2016
 
2015
Current:
 
 
 
 
 
U.S. Federal
$
16,882

 
$
14,703

 
$
12,294

State
2,479

 
2,987

 
2,010

Foreign
2,687

 
3,467

 
1,371

Total current
22,048

 
21,157

 
15,675

Deferred:
 
 
 
 
 
U.S. Federal
(7,466
)
 
(5,404
)
 
(178
)
State
1,246

 
1,595

 
273

Foreign
(885
)
 
(1,084
)
 
(2,146
)
Total deferred
(7,105
)
 
(4,893
)
 
(2,051
)
Provision for income taxes
$
14,943

 
$
16,264

 
$
13,624
(Benefit of) Provision for Income Taxes from Discontinued Operations
The benefit of income taxes from discontinued operations for the years ended December 31 consisted of the following (in thousands):
 
2017
 
2016
 
2015
Current:
 
 
 
 
 
U.S. Federal
$
219

 
$
24

 
$
15

State
20

 
2

 
1

Foreign
—

 
—

 
—

Benefit of income taxes
$
239

 
$
26

 
$
16
Provision for Income Taxes from Continuing Operations Differs from the Federal Statutory Rate
The provision for income taxes from continuing operations differs from the federal statutory rate of 35% for the years ended December 31 due to the following (in thousands):
 
2017
 
2016
 
2015
Statutory rate
$
27,268

 
35.0
 %
 
$
17,494

 
35.0
 %
 
$
12,985

 
35.0
 %
State taxes, less federal effect
2,442

 
3.1
 %
 
3,033

 
6.1
 %
 
1,845

 
5.0
 %
Tax effect of Tax Reform Act
(12,535
)
 
(16.1
)%
 
—

 
—
 %
 
—

 
—
 %
Domestic manufacturer's deduction
(1,578
)
 
(2.0
)%
 
(1,363
)
 
(2.7
)%
 
(795
)
 
(2.1
)%
Excess tax benefit on stock based compensation
(1,415
)
 
(1.8
)%
 
—

 
—
 %
 
—

 
—
 %
Federal tax credits
(373
)
 
(0.5
)%
 
(439
)
 
(0.9
)%
 
(242
)
 
(0.7
)%
Uncertain tax positions
(148
)
 
(0.2
)%
 
(154
)
 
(0.3
)%
 
(344
)
 
(0.9
)%
Change in valuation allowance
660

 
0.8
 %
 
685

 
1.4
 %
 
284

 
0.7
 %
Non-deductible expenses
499

 
0.7
 %
 
556

 
1.1
 %
 
2

 
—
 %
Foreign rate differential
2

 
—
 %
 
(677
)
 
(1.4
)%
 
(6
)
 
—
 %
Intangible asset impairment
—

 
—
 %
 
341

 
0.7
 %
 
—

 
—
 %
Worthless stock deduction
—

 
—
 %
 
(868
)
 
(1.7
)%
 
—

 
—
 %
Intercompany debt discharge
—

 
—
 %
 
(2,389
)
 
(4.8
)%
 
—

 
—
 %
Other
121

 
0.2
 %
 
45

 
—
 %
 
(105
)
 
(0.3
)%
 
$
14,943

 
19.2
 %
 
$
16,264

 
32.5
 %
 
$
13,624

 
36.7
 %
Deferred Tax Liabilities (Assets)
Deferred tax liabilities (assets) at December 31 consist of the following (in thousands):
 
2017
 
2016
Depreciation
$
9,563

 
$
17,367

Goodwill
32,662

 
43,562

Intangible assets
10,928

 
14,731

Foreign withholding tax
1,014

 
—

Other
652

 
892

Gross deferred tax liabilities
54,819

 
76,552

Equity compensation
(12,577
)
 
(21,439
)
Other
(13,247
)
 
(18,473
)
Gross deferred tax assets
(25,824
)
 
(39,912
)
Valuation allowances
2,242

 
1,362

Deferred tax assets, net of valuation allowances
(23,582
)
 
(38,550
)
Net deferred tax liabilities
$
31,237

 
$
38,002
Summary of Valuation Allowance
The following sets forth a reconciliation of the beginning and ending amount of the Company’s valuation allowance (in thousands):
 
2017
 
2016
 
2015
Balance as of January 1
$
1,362

 
$
766

 
$
400

Cost charged to the tax provision
1,505

 
983

 
286

Reductions
(820
)
 
(338
)
 
(78
)
Currency translation
195

 
(49
)
 
—

Balance as of December 31
$
2,242

 
$
1,362

 
$
766
Income Taxes Paid, Net of Tax Refunds
The Company made net payments for income taxes for the following amounts for the years ended December 31 (in thousands):
 
2017
 
2016
 
2015
Payments made for income taxes, net
$
26,186

 
$
17,700

 
$
11,879
Reconciliation of the Beginning and Ending Amount of Unrecognized Tax Benefits
A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows (in thousands):
 
2017
 
2016
 
2015
Balance as of January 1
$
3,466

 
$
3,876

 
$
1,414

Additions for tax positions of the current year
99

 
33

 
148

Additions for tax positions of prior years
—

 
—

 
2,955

Reductions for tax positions of prior years for:
 
 
 
 
 
Settlements and changes in judgment
(422
)
 
(256
)
 
(331
)
Lapses of applicable statute of limitations
—

 
—

 
(310
)
Divestitures and foreign currency translation
393

 
(187
)
 
—

Balance as of December 31
$
3,536

 
$
3,466

 
$
3,876
Interest (Net of Federal Tax Benefit) and Penalties Recognized
Interest (net of federal tax benefit) and penalties recognized during the years ended December 31 were (in thousands):
 
2017
 
2016
 
2015
Interest and penalties recognized as income
$
130

 
$
122

 
$
87