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Stock-Based Compensation Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value [Table Text Block]
The weighted-average fair value of options issued and total intrinsic value of options exercised were (in thousands, except share prices):
 
 
2013
 
2012
 
2011
Weighted-average grant date fair value of options
 
$
10.55

 
$
6.24

 
$
6.68

Total intrinsic value of options exercised
 
$
12,917

 
$
1,697

 
$
896
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]
Information about our stock options that are outstanding, options that we expect to vest and options that are exercisable at December 31, 2013 follows (in thousands except share prices and lives):
Options Expected to Vest:
 
Number
 
Weighted-Average Exercise Price
 
Weighted-Average Remaining Contractual Life
 
Aggregate Intrinsic Value
Options outstanding
 
2,812

 
$
12.27

 
6.7 years
 
$
29,787

Options expected to vest
 
2,597

 
12.41

 
6.6 years
 
27,164

Options exercisable
 
1,243

 
12.82

 
5.4 years
 
12,505
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
The fair value of options granted during the years ended December 31, 2013, 2012 and 2011 was estimated on the date of grant using the Black-Scholes-Merton option-pricing model using the following assumptions by grant year (except the market awards granted to our Chief Executive Officer as noted above):
 
 
2013
 
2012
 
2011
Fair value assumptions - stock options:
 
 
 
 
 
 
Risk-free interest rates
 
0.74%
 
0.6% - 1.2%
 
1.09% - 2.4%
Expected dividend yield rates
 
—%
 
—%
 
—%
Expected term
 
5.6 years
 
5.9 years
 
5.5 years
Expected volatility
 
69%
 
61.5%
 
58%
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block]
The following table summarizes information about the stock options outstanding at December 31, 2013 (in thousands, except share prices and lives):
 
 
Options Outstanding
 
Options Exercisable
Range of Exercise Prices
 
Number Outstanding
 
Weighted-Average Remaining Contractual Life
 
Weighted-Average Exercise Price
 
Number Exercisable
 
Weighted-Average Exercise Price
$7.15 to $7.95
 
132

 
2.2 years
 
$
7.35

 
132

 
$
7.35

$8.65 to $8.65
 
384

 
7.6 years
 
8.65

 
218

 
8.65

$8.95 to $10.90
 
160

 
6.3 years
 
9.61

 
83

 
9.70

$11.02 to $11.02
 
871

 
8.0 years
 
11.02

 
98

 
11.02

$11.21 to $12.77
 
293

 
7.0 years
 
12.24

 
153

 
12.18

$12.80 to $14.21
 
331

 
6.4 years
 
13.82

 
165

 
13.79

$14.40 to $15.65
 
327

 
6.6 years
 
14.82

 
161

 
14.88

$16.13 to $22.30
 
272

 
4.2 years
 
18.61

 
191

 
19.28

$22.47 to $22.47
 
21

 
3.6 years
 
22.47

 
21

 
22.47

$24.21 to $24.21
 
21

 
3.3 years
 
24.21

 
21

 
24.21

$7.15 to $24.21
 
2,812

 
6.7 years
 
12.27

 
1,243

 
12.82
Restricted Stock Units (RSUs) [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value [Table Text Block]
The weighted-average fair value of RSUs issued and total fair value of RSUs converted to shares were (in thousands, except share prices):
 
 
2013
 
2012
 
2011
Weighted-average grant date fair value of RSUs
 
$
17.73

 
$
11.20

 
$
12.94

Total fair value of RSUs converted to shares
 
$
11,032

 
$
8,908

 
$
1,974
Employee Stock [Member]
  
Schedule of Share-based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions [Table Text Block]
The fair value of each purchase right granted under the ESPP was estimated on the date of grant using the Black-Scholes-Merton option pricing model with the following assumptions:
 
 
2013
 
2012
 
2011
Risk-free interest rates
 
0.07% - 0.1%

 
0.15% - 0.61%

 
0.05% - 0.1%

Expected dividend yield rates
 
—
%
 
—
%
 
—
%
Expected term
 
0.5 years

 
0.5 years

 
0.5 years

Expected volatility
 
61.5
%
 
60.4
%
 
61.9
%
Performance Based [Member]
  
Schedule of Stock Options Roll Forward [Table Text Block]
Changes in outstanding performance based stock options during the year ended December 31, 2013 were as follows (in thousands, except share prices):
 
 
2013
 
2012
 
2011
 
 
Shares
 
Weighted-Average Exercise Price
 
Shares
 
Weighted-Average Exercise Price
 
Shares
 
Weighted-Average Exercise Price
Changes in outstanding stock options:
 
 
 
 
 
 
 
 
 
 
Options outstanding at beginning of year
 
1,623

 
$
12.65

 
225

 
$
24.75

 
—

 
$
—

Options granted
 
43

 
17.80

 
1,660

 
11.15

 
225

 
24.75

Options exercised
 
(89
)
 
11.02

 
—

 
—

 
—

 
—

Options forfeited
 
(87
)
 
11.02

 
(262
)
 
11.02

 
—

 
—

Options expired
 
(251
)
 
11.10

 
—

 
—

 
—

 
—

Options outstanding at end of year
 
1,239

 
13.38

 
1,623

 
12.65

 
225

 
24.75

 
 
 
 
 
 
 
 
 
 
 
 
 
Options vested during the year
 
314

 
 
 
—

 
 
 
—

 
 
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]
Changes in the unvested performance based restricted stock units during the year ended December 31, 2013 were as follows (in thousands):
 
 
2013
 
2012
 
2011
 
 
Shares
 
Weighted-Average Grant Date Fair Value
 
Shares
 
Weighted-Average Grant Date Fair Value
 
Shares
 
Weighted-Average Grant Date Fair Value
Balance at beginning of year
 
1,631

 
$
11.15

 
—

 
$
—

 
—

 
$
—

RSUs granted
 
50

 
17.80

 
1,937

 
11.13

 
—

 
—

RSUs vested
 
(235
)
 
11.10

 
—

 
—

 
—

 
—

RSUs forfeited
 
(102
)
 
11.02

 
(306
)
 
11.02

 
—

 
—

Balance at beginning of year
 
1,344

 
11.42

 
1,631

 
11.15

 
—

 
—
Time Based [Member]
  
Schedule of Stock Options Roll Forward [Table Text Block]
Changes in outstanding time based stock options during the year ended December 31, 2013 were as follows (in thousands, except share prices):
 
 
2013
 
2012
 
2011
 
 
Shares
 
Weighted-Average Exercise Price
 
Shares
 
Weighted-Average Exercise Price
 
Shares
 
Weighted-Average Exercise Price
Changes in outstanding stock options:
 
 
 
 
 
 
 
 
 
 
Options outstanding at beginning of year
 
4,036

 
$
13.61

 
5,596

 
$
14.04

 
5,709

 
$
14.72

Options granted
 
—

 
—

 
18

 
11.67

 
1,518

 
12.52

Options exercised
 
(2,055
)
 
13.31

 
(446
)
 
9.17

 
(216
)
 
10.60

Options forfeited
 
(199
)
 
13.01

 
(455
)
 
12.99

 
(886
)
 
13.20

Options expired
 
(209
)
 
19.74

 
(677
)
 
20.41

 
(529
)
 
19.73

Options outstanding at end of year
 
1,573

 
13.29

 
4,036

 
13.61

 
5,596

 
14.04

 
 
 
 
 
 
 
 
 
 
 
 
 
Options vested during the year
 
294

 
 
 
73

 
 
 
49

 
 
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]
Changes in the unvested time based restricted stock units during the year ended December 31, 2013 were as follows (in thousands):
 
 
2013
 
2012
 
2011
 
 
Shares
 
Weighted-Average Grant Date Fair Value
 
Shares
 
Weighted-Average Grant Date Fair Value
 
Shares
 
Weighted-Average Grant Date Fair Value
Balance at beginning of year
 
442

 
$
12.96

 
764

 
$
12.99

 
447

 
$
13.82

RSUs granted
 
99

 
17.58

 
75

 
12.93

 
623

 
13.72

RSUs vested
 
(242
)
 
12.99

 
(253
)
 
12.93

 
(147
)
 
15.56

RSUs forfeited
 
(69
)
 
12.88

 
(144
)
 
12.94

 
(159
)
 
13.32

Balance at beginning of year
 
230

 
13.41

 
442

 
12.96

 
764

 
12.99