XML 52 R43.htm IDEA: XBRL DOCUMENT
v2.4.0.6

Earnings per share (Tables) | 9 Months Ended
--- | ---
Sep. 30, 2012
Earnings per share |
Schedule of earnings per share |
|  | Three months ended September 30 |  | Nine months ended September 30 |
|  | 2012 |  | 2011 |  | 2012 |  | 2011 |
|  | Basic and diluted |  | Basic and diluted |  | Basic and diluted |  | Basic and diluted |
Distributed earnings |  | $ | 0.31 |  | $ | 0.31 |  | $ | 0.93 |  | $ | 0.93 |
Undistributed earnings |  | 0.18 |  | 0.19 |  | 0.36 |  | 0.16 |
|  | $ | 0.49 |  | $ | 0.50 |  | $ | 1.29 |  | $ | 1.09 |

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 an entity's basic and diluted earnings per share calculations. + References No definition available. + Details
Name: | us-gaap_ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration