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Income Taxes (Tables)
12 Months Ended
Dec. 27, 2014
Income Tax Disclosure [Abstract]  
Provision for income taxes
The provision for income taxes consists of the following (in thousands):

 
2014
 
2013
 
2012
Current tax expense:
 
 
 
 
 
Federal
$
211,383

 
$
175,039

 
$
165,519

State
25,133

 
19,129

 
20,342

Total current
236,516

 
194,168

 
185,861

 
 
 
 
 
 
Deferred tax (benefit) expense:
 

 
 

 
 

Federal
(14,493
)
 
(5,341
)
 
(20,857
)
State
(5,321
)
 
(2,968
)
 
(5,724
)
Total deferred
(19,814
)
 
(8,309
)
 
(26,581
)
Total provision
$
216,702

 
$
185,859

 
$
159,280

Deferred tax assets and liabilities
Deferred income taxes reflect the net tax effects of temporary differences between the carrying amounts of assets and liabilities for financial reporting purposes and the amounts used for income tax purposes.  Significant components of the deferred tax assets and liabilities are as follows (in thousands):
 
2014
 
2013
Current tax assets:
 
 
 
Inventory valuation
$
16,602

 
$
12,133

Accrued employee benefit costs
18,770

 
23,184

Accrued sales tax audit reserve
2,053

 
1,905

Other
11,585

 
10,388

 
49,010

 
47,610

Current tax liabilities:
 

 
 

Inventory basis difference
(4,657
)
 
(14,470
)
Prepaid expenses
(2,109
)
 
(2,100
)
Other
(1,282
)
 
(1,202
)
 
(8,048
)
 
(17,772
)
Net current tax asset
$
40,962

 
$
29,838

 
 
 
 
Non-current tax assets:
 

 
 

Rent expenses in excess of cash payments required
27,166

 
25,229

Deferred compensation
17,956

 
16,394

Workers compensation insurance
6,989

 
5,734

General liability insurance
2,741

 
557

Lease exit obligations
2,437

 
2,354

Income tax credits
2,205

 

Accrued sales tax audit reserve
2,085

 
1,547

Other
3,745

 
3,452

 
65,324

 
55,267

Non-current tax liabilities:
 

 
 

Depreciation
(52,626
)
 
(51,547
)
Other
(3,916
)
 
(3,628
)
 
(56,542
)
 
(55,175
)
Net non-current tax asset
$
8,782

 
$
92

 
 
 
 
Net deferred tax asset
$
49,744

 
$
29,930

Reconciliation of the provision for income taxes to the amounts computed at the federal statutory rate
A reconciliation of the provision for income taxes to the amounts computed at the federal statutory rate is as follows (in thousands):
 
2014
 
2013
 
2012
Tax provision at statutory rate
$
205,656

 
$
179,933

 
$
152,508

Tax effect of:
 
 
 

 
 

State income taxes, net of federal tax benefits
12,878

 
10,505

 
9,502

Permanent differences
(1,832
)
 
(4,579
)
 
(2,730
)
 
$
216,702

 
$
185,859

 
$
159,280

Reconciliation of gross unrecognized tax benefits
A reconciliation of the beginning and ending gross amount of unrecognized tax benefits (exclusive of interest and penalties) is as follows (in thousands):
 
2014
 
2013
 
2012
Balance at beginning of year
$
2,482

 
$
5,898

 
$
5,774

Additions based on tax positions related to the current year
1,104

 
741

 
1,358

Additions for tax positions of prior years
280

 

 

Reductions for tax positions of prior years
(366
)
 
(3,937
)
 
(1,234
)
Reductions due to audit results

 
(220
)
 

Balance at end of year
$
3,500

 
$
2,482

 
$
5,898