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Stock Options, Employee Stock Purchase Plan and Restricted Stock (Tables)
 12 Months Ended
Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

 

 

 

2015

 

2014 (as Restated)

 

2013

 

Expected volatility

 

42%

 

—

 

47%

 

40%

 

—

 

71%

 

49%

 

—

 

68%

 

Expected life (in years)

 

 

 

4.8

 

 

 

 

 

4.1

 

 

 

 

 

4.0

 

 

 

Risk-free interest rate

 

1.5%

 

—

 

1.6%

 

0.9%

 

—

 

2.2%

 

0.7%

 

—

 

1.4%

 

Dividend yield

 

 

 

—

 

 

 

 

 

—

 

 

 

 

 

—

 

 

 

Fair value per stock option

 

 

 

$14.59

 

 

 

 

 

$12.89

 

 

 

 

 

$6.95

 

 

 

 

Schedule of Share-based Compensation, Activity [Table Text Block]

 

 

 

Number of
Shares
(in
thousands)

 

     Weighted
Average
Exercise
Price

 

Weighted
Average
Remaining
Contractual
Term
(Years)

 

Aggregate
Intrinsic
Value
(in
thousands)
(1)

 

Outstanding at December 31, 2012

 
9,727

 

$
4.22

 

 

 

 

 

Granted

 
321

 
15.76

 

 

 

 

 

Exercised

 
(630

)
4.18

 

 

 

 

 

Forfeited or expired

 
(190

)
13.10

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Outstanding at December 31, 2013

 
9,228

 

$
4.45

 

 

 

 

 

Granted

 
1,475

 
28.59

 

 

 

 

 

Exercised

 
(4,226

)
1.91

 

 

 

 

 

Forfeited or expired

 
(91

)
22.56

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Outstanding at December 31, 2014

 
6,386

 

$
11.44

 

 

 

 

 

Granted

 
1,016

 
37.60

 

 

 

 

 

Exercised

 
(2,519

)
4.09

 

 

 

 

 

Forfeited or expired

 
(121

)
34.78

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Outstanding at December 31, 2015

 
4,762

 

$
20.33

 
3.41

 

$
80,868

 

 

 

 

 

 

 

 

 

 

 

 

 

Exercisable at December 31, 2015

 
2,510

 

$
11.28

 
1.43

 

$
65,341

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(1)

May include value from potentially anti-dilutive options whose exercise price exceeds the closing stock price.
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]

 

 

 

Number of
Units
(in
thousands)

 

Weighted
Average
Grant Date
Fair Value

 

Nonvested at December 31, 2012

 
18

 

$
14.63

 

Granted

 
32

 
15.36

 

Vested

 
(34

)
14.98

 

Canceled

 

—

 

—

 

 

 

 

 

 

 

Nonvested at December 31, 2013

 
16

 

$
15.36

 

Granted

 
337

 
35.31

 

Vested

 
(16

)
15.36

 

Canceled

 

—

 

—

 

 

 

 

 

 

 

Nonvested at December 31, 2014

 
337

 

$
35.31

 

Granted

 

—

 

—

 

Vested (1)

 
(84

)
35.31

 

Canceled

 

—

 

—

 

 

 

 

 

 

 

Nonvested at December 31, 2015

 
253

 

$
35.31

 

 

 

(1)

As a result of the delay in filing the 2015 financials, approximately 66,000 units of restricted stock vested but have not yet been issued to grantees as of and for the year ended December 31, 2015.