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Share-based Compensation Plans and Awards - Stock Options Activity (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
|
9 Months Ended |
12 Months Ended |
|
Sep. 30, 2012
|
Dec. 31, 2011
|
| Number of options outstanding |
|
|
| Outstanding at period start |
16,654 |
|
| Options granted |
0 |
|
| Options exercised |
(2,288) |
|
| Options forfeited or canceled |
(997) |
|
| Outstanding at period end |
13,369 |
16,654 |
| Exercisable |
6,990 |
|
| Vested and expected to vest |
11,967 |
|
| Weighted average exercise price |
|
|
| Outstanding at period start, weighted average exercise price (usd per share) |
$ 13.21 |
|
| Options granted, weighted average exercise price (usd per share) |
$ 0.00 |
|
| Options exercised, weighted average exercise price (usd per share) |
$ 3.86 |
|
| Options forfeited or canceled , weighted average exercise price (usd per share) |
$ 12.77 |
|
| Outstanding at period end, weighted average exercise price (usd per share) |
$ 14.84 |
$ 13.21 |
| Exercisable, weighted average exercise price (usd per share) |
$ 7.63 |
|
| Vested and expected to vest, weighted average exercise price (usd per share) |
$ 13.86 |
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| Weighted average remaining contractual term (in years) |
|
|
| Outstanding at period start, weighted average remaining contractual term |
6 years 6 months 4 days |
7 years 6 months 11 days |
| Outstanding at period end, weighted average remaining contractual term |
6 years 6 months 4 days |
7 years 6 months 11 days |
| Vested and expected to vest, weighted average remaining contractual term |
6 years 4 months 10 days |
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| Aggregate intrinsic value |
|
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| Outstanding at period start, aggregate intrinsic value |
$ 17,480 |
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| Outstanding at period end, aggregate intrinsic value |
30,409 |
17,480 |
| Exercisable, aggregate intrinsic value |
27,425 |
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| Vested and expected to vest, aggregate intrinsic value |
$ 29,807 |
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