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Equity Incentive Plans (Tables)
 12 Months Ended
Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]
The following table summarizes activity related to our RSUs under the Equity Incentive Plan:
 
Number
Outstanding
 
Weighted
Average
Grant Date
Fair Value
 
Weighted Average Remaining Contractual Term
(in years)
 
Aggregate Intrinsic Value
   (in thousands) (1)
Unvested as of January 1, 2013
2,351,362

 
$
14.02

 
 
 
 
Granted
924,312

 
$
22.18

 
 
 
 
Vested
(594,961
)
 
$
15.05

 
 
 
 
Forfeited / Canceled
(122,500
)
 
$
16.25

 
 
 
 
Unvested as of December 31, 2013
2,558,213

 
$
16.63

 
 
 
 
Granted
664,897

 
$
31.82

 
 
 
 
Vested
(975,462
)
 
$
17.01

 
 
 
 
Forfeited / Canceled
(96,416
)
 
$
20.73

 
 
 
 
Unvested as of December 31, 2014
2,151,232

 
$
20.97

 
 
 
 
Granted
926,051

 
$
27.08

 
 
 
 
Vested
(994,130
)
 
$
19.87

 
 
 
 
Forfeited / Canceled
(101,861
)
 
$
24.66

 
 
 
 
Unvested as of December 31, 2015
1,981,292

 
$
24.19

 
 
 
 
Expected to vest after December 31, 2015
1,940,820

 
$
24.13

 
2.3
 
$
57,506
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]
The following table summarizes activity related to our stock options under the Equity Incentive Plan:
 
Number
Outstanding
 
Weighted
Average Exercise Price
 
Weighted Average Remaining Contractual Term
(in years)
 
Aggregate Intrinsic Value
   (in thousands) (1)
Balance as of January 1, 2013
9,355,070

 
$
6.90

 
 
 
 
Exercised
(2,399,419
)
 
$
6.41

 
 
 
$
46,899

Forfeited / Canceled
(123,320
)
 
$
8.89

 
 
 
 
Balance as of December 31, 2013
6,832,331

 
$
7.04

 
 
 
 
Granted
126,755

 
$
32.31

 
 
 
 
Exercised
(1,687,700
)
 
$
5.52

 
 
 
$
38,373

Forfeited / Canceled
(63,614
)
 
$
16.10

 
 
 
 
Balance as of December 31, 2014
5,207,772

 
$
8.04

 
 
 
 
Exercised
(1,425,075
)
 
$
6.22

 
 
 
$
32,375

Forfeited / Canceled
(16,745
)
 
$
28.12

 
 
 
 
Balance as of December 31, 2015
3,765,952

 
$
8.63

 
2.9
 
$
79,317

Exercisable as of December 31, 2015
3,673,816

 
$
8.04

 
2.9
 
$
79,317

Exercisable as of December 31, 2015 and expected to vest thereafter
3,756,738

 
$
8.58

 
2.9
 
$
79,317
Nonvested Restricted Stock Shares Activity [Table Text Block]
The following table summarizes activity related to our restricted stock under the Equity Incentive Plan:
 
Number
Outstanding
 
Weighted
Average
Grant Date
Fair Value
Unvested as of January 1, 2013
116,000

 
$
9.47

Vested
(96,000
)
 
$
9.51

Unvested as of December 31, 2013
20,000

 
$
9.30

Vested
(20,000
)
 
$
9.30

Unvested as of December 31, 2014
—

 
$
—
Schedule Of Pre-Tax Stock-Based Compensation Expense
The components of pre-tax stock-based compensation expense are as follows (in thousands):
 
Year Ended December 31,
 
2015
 
2014
 
2013
RSUs
$
21,058

 
$
18,965

 
$
17,299

Stock options
278

 
2,917

 
4,529

Restricted stock
—

 
139

 
208

Total stock-based compensation expense
$
21,336

 
$
22,021

 
$
22,036
Schedule Of Stock-Based Compensation Expense Included In Statements Of Income
The following table sets forth the classification of total stock-based compensation expense included in our Consolidated Statements of Income (in thousands):
 
Year Ended December 31,
 
2015
 
2014
 
2013
Cost of goods sold
$
358

 
$
410

 
$
392

Facility and warehouse expenses
2,271

 
2,195

 
2,745

Selling, general and administrative expenses
18,707

 
19,416

 
18,899

 
21,336

 
22,021

 
22,036

Income tax benefit
(8,221
)
 
(8,478
)
 
(8,594
)
Total stock-based compensation expense, net of tax
$
13,115

 
$
13,543

 
$
13,442
Schedule Of Stock-Based Compensation Expense Expected To Be Recognized
As of December 31, 2015, unrecognized compensation expense related to unvested RSUs and stock options is expected to be recognized as follows (in thousands):
 
RSUs
 
Stock
Options
 
Total
2016
$
13,997

 
$
267

 
$
14,264

2017
8,760

 
7

 
8,767

2018
5,334

 
—

 
5,334

2019
2,754

 
—

 
2,754

2020
30

 
—

 
30

Total unrecognized compensation expense
$
30,875

 
$
274

 
$
31,149