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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 27, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Stock Option Activity Under The Principal Option Plans
Option activity under the principal option plans as of December 27, 2015 and changes during the year then ended were as follows:

 
Number of
Shares

 
Weighted-
Average
Exercise
Price

 
Weighted-
Average
Remaining
Contractual
Term
(in years)
 
Aggregate
Intrinsic
Value
(in thousands)

Outstanding at December 28, 2014
2,349,447

 
$
17.77

 
3.98
 
$
2,716

Granted
373,440

 
11.38

 
 
 
 
Exercised
(15,430
)
 
8.98

 
 
 
 
Forfeited or expired
(441,465
)
 
18.72

 
 
 
 
Outstanding at December 27, 2015
2,265,992

 
$
16.59

 
4.49
 
$
18,662

Vested and expected to vest at December 27, 2015
2,265,992

 
$
16.59

 
4.49
 
$
18,662

Exercisable at December 27, 2015
1,743,945

 
$
17.90

 
3.14
 
$
—
Nonvested Service Based Restricted Stock Units
Nonvested service-based restricted stock units as of December 27, 2015 and changes during the year ended December 27, 2015 were as follows:

 
Number of
Shares

 
Weighted-
Average
Vest Date
(in years)

 
Weighted-
Average
Grant Date
Fair Value

Nonvested at December 28, 2014
940,857

 
0.56

 
$
17.11

Granted
339,310

 
 
 
$
12.47

Vested
(293,338
)
 
 
 
$
12.89

Forfeited
(43,913
)
 
 
 
$
14.47

Nonvested at December 27, 2015
942,916

 
0.74

 
$
16.88

Vested and expected to vest at December 27, 2015
942,916

 
0.74

 
 

Vested at December 27, 2015
424,375

 
—