|
Stock-Based Compensation (Details) (USD $)
|
12 Months Ended |
|
Dec. 31, 2013
|
Dec. 31, 2012
|
Dec. 31, 2011
|
| Stock-based compensation |
|
|
|
| Stock-based compensation expense |
$ 10,395,000 |
$ 13,655,000 |
$ 12,283,000 |
| Stock-based compensation related to acquisition |
0 |
0 |
42,000 |
|
Actek, Inc.
|
|
|
|
| Stock-based compensation |
|
|
|
| Stock-based compensation related to acquisition |
0 |
0 |
42,000 |
|
Options
|
|
|
|
| Stock-based compensation |
|
|
|
| Stock-based compensation expense |
866,000 |
838,000 |
1,171,000 |
| Unrecognized compensation expense, stock options |
2,600,000 |
|
|
| Weighted average recognition period |
3 years 4 months 2 days |
|
|
|
Restricted Stock Units
|
|
|
|
| Stock-based compensation |
|
|
|
| Unrecognized compensation expense, share-based awards other than options |
5,800,000 |
|
|
| Weighted average recognition period |
1 year 4 months 7 days |
|
|
|
Performance Awards
|
|
|
|
| Stock-based compensation |
|
|
|
| Stock-based compensation expense |
1,097,000 |
444,000 |
665,000 |
|
Non-performance Awards
|
|
|
|
| Stock-based compensation |
|
|
|
| Stock-based compensation expense |
7,835,000 |
11,571,000 |
10,173,000 |
|
ESPP
|
|
|
|
| Stock-based compensation |
|
|
|
| Stock-based compensation expense |
597,000 |
802,000 |
232,000 |
| Unrecognized compensation expense, share-based awards other than options |
$ 300,000 |
|
|
| Weighted average recognition period |
0 years 7 months 6 days |
|
|