XML 41 R30.htm IDEA: XBRL DOCUMENT
v3.7.0.1

Supplemental cash flow information (Tables) | 3 Months Ended
--- | ---
Mar. 31, 2017
Supplemental Cash Flow Elements [Abstract] |
Supplemental cash flow information |
| Three months ended March 31,
| 2017 | 2016
Cash paid for: |  |
Interest | $ | 174 |  | $ | 160 |
Income taxes | 3,049 |  | 2,596 |

X
- Definition Tabular disclosure of supplemental cash flow information for the periods presented. + References No definition available. + Details
Name: | us-gaap_ScheduleOfCashFlowSupplementalDisclosuresTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_SupplementalCashFlowElementsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration