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Stock-Based Compensation (Tables)
 6 Months Ended
Jun. 28, 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 June 28, 2015 and changes during the six months ended June 28, 2015 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
266,080

 
13.40

 
 
 
 

Exercised
(11,377
)
 
9.42

 
 
 
 

Forfeited or expired
(381,538
)
 
18.89

 
 
 
 

Outstanding at June 28, 2015
2,222,612

 
$
17.10

 
4.70
 
$
758

Vested and expected to vest at June 28, 2015
2,120,446

 
$
17.26

 
4.47
 
$
755

Exercisable at June 28, 2015
1,717,387

 
$
18.37

 
3.47
 
$
554
Assumptions And Weighted-Average Fair Values Of Share-Based Payment Units Under Black-Scholes Option Pricing Model
The weighted-average fair values and assumptions were as follows:
Six months ended
June 28,
2015

 
June 29,
2014

Weighted-average fair value of grants
$
5.48

 
$
6.42

Valuation assumptions:
 

 
 

  Expected life (in years)
5.51

 
5.12

  Expected dividend yield
0.00
%
 
0.00
%
  Expected volatility
45.95
%
 
48.12
%
  Risk-free interest rate
1.541
%
 
1.464
%
Nonvested Service Based Restricted Stock Units
Nonvested restricted stock units as of June 28, 2015 and changes during the six months ended June 28, 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
331,000

 
 

 
$
12.61

Vested
(290,938
)
 
 

 
$
12.93

Forfeited
(33,644
)
 
 

 
$
14.73

Nonvested at June 28, 2015
947,275

 
1.23

 
$
16.91

Vested and expected to vest at June 28, 2015
850,831

 
1.15

 
 

Vested and deferred at June 28, 2015
424,375

 
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