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INCOME TAXES (Tables)
12 Months Ended
Dec. 31, 2019
Income Tax Disclosure [Abstract]  
Schedule of components of income tax expense

The components of the provision for income taxes attributable to operations consist of the following (in thousands):
 
Year Ended December 31,
 
2019
 
2018
 
2017
Current:
 
 
 
 
 
Federal
$
53,039

 
$
36,167

 
$
41,453

State
13,422

 
5,140

 
3,518

Foreign
1,305

 
708

 
295

Total current
67,766

 
42,015

 
45,266

Deferred:
 

 
 

 
 

Federal
6,881

 
6,576

 
(7,917
)
State
2,424

 
(2,582
)
 
4,695

Foreign
(1,085
)
 
(328
)
 
319

Total deferred
8,220

 
3,666

 
(2,903
)
Total provision for income taxes
$
75,986

 
$
45,681

 
$
42,363


Schedule of deferred tax assets and liabilities
The components of deferred tax assets and liabilities consist of the following (in thousands):
 
December 31,
 
2019
 
2018
Deferred tax assets:
 
 
 
Reserve for bad debts
1,312

 
1,457

Accrued compensation
4,297

 
4,803

Stock compensation
13,877

 
10,041

Net operating losses
20,555

 
26,349

Accrued reserve and other
4,177

 
1,773

Lease liabilities
36,472

 

Deferred rent

 
5,928

Deferred gain on the sale of building

 
4,140

Research and development credits
6,341

 
6,331

Total deferred tax assets, prior to valuation allowance
87,031

 
60,822

 
 
 
 
Valuation allowance
(13,553
)
 
(14,246
)
Total deferred tax assets, net of valuation allowance
73,478

 
46,576

 
 
 
 
Deferred tax liabilities:
 

 
 

Deferred commission costs, net
(22,612
)

(19,314
)
Lease right-of-use assets
(30,830
)
 

Prepaid expenses
(1,548
)
 
(2,204
)
Property and equipment, net
(8,891
)
 
(5,367
)
Intangible assets, net
(91,285
)
 
(82,079
)
Total deferred tax liabilities
(155,166
)
 
(108,964
)
 
 
 
 
Net deferred tax assets (liabilities)
$
(81,688
)
 
$
(62,388
)

Schedule of effective income tax rate reconciliation
The Company’s provision for income taxes resulted in effective tax rates that varied from the statutory federal income tax rate as follows (in thousands):

 
Year Ended December 31,
 
2019
 
2018
 
2017
 
 
 
 
 
 
Expected federal income tax provision at statutory rate
$
82,099

 
$
59,643

 
$
57,770

State income taxes, net of federal benefit
14,884

 
10,312

 
4,776

Foreign income taxes, net effect
1,515

 
(315
)
 
(3,540
)
Increase (decrease) in valuation allowance
(693
)
 
1,214

 
3,624

Tax rate changes
(13
)
 
141

 
(7,340
)
Research credits
(12,188
)
 
(15,373
)
 
(20,547
)
Excess tax benefit
(15,282
)
 
(14,227
)
 
(7,010
)
Tax reserves
3,135

 
1,870

 
12,646

Other adjustments
2,529

 
2,416

 
1,984

Income tax expense
$
75,986

 
$
45,681

 
$
42,363


Schedule of unrecognized tax benefits

The following table summarizes the activity related to the Company’s unrecognized tax benefits (in thousands):
 
Unrecognized tax benefit as of December 31, 2016                                                                                                                
$
1,843

Increase for current year tax positions
12,620

Decrease for prior year tax positions
(34
)
Expiration of the statute of limitation for assessment of taxes
(66
)
Unrecognized tax benefit as of December 31, 2017                                                                                                         
14,363

Increase for current year tax positions
9,561

Decrease for prior year tax positions
(70
)
Expiration of the statute of limitation for assessment of taxes
(1,482
)
Unrecognized tax benefit as of December 31, 2018                                                                                                               
22,372

Increase for current year tax positions
3,487

Increase for prior year tax positions
440

Expiration of the statute of limitation for assessment of taxes
(832
)
Unrecognized tax benefit as of December 31, 2019                                                                                                               
$
25,467