XML 20 R33.htm IDEA: XBRL DOCUMENT
v2.4.0.6

Earnings Per Share (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2011
Earnings Per Share [Abstract] |
Summary of weighted average number of common shares outstanding |
|  |  | September 30, |  |  |  | September 30, |  |  |  | September 30, |
|  | Year Ended December 31, |
|  | 2011 |  |  | 2010 |  |  | 2009 |
Denominator: |  |  |  |  |  |  |  |  |  |  |  |
Basic common shares outstanding |  |  | 44,631 |  |  |  | 45,722 |  |  |  | 45,184 |
Effect of dilutive stock options and restricted stock |  |  | 474 |  |  |  | 674 |  |  |  | 319 |
Diluted common shares outstanding |  |  | 45,105 |  |  |  | 46,396 |  |  |  | 45,503 |

X
- Details
Name: | us-gaap_EarningsPerShareAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the weighted average number of shares used in calculating basic net earnings per share (or unit) and diluted earnings per share (or unit). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Topic 260 -SubTopic 10 -Publisher FASB -Number -Article -Subparagraph -Name Accounting Standards Codification -Paragraph 1 -Section 50 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
Name: | us-gaap_ScheduleOfWeightedAverageNumberOfSharesTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration