v2.4.1.9

Supplemental cash flow information (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2014
Supplemental Cash Flow Elements [Abstract] |
Supplemental Cash Flow Information | The table below provides supplemental cash flow information:
|  | Year ended December 31, |
|  | 2014 |  |  | 2013 |  |  | 2012 |
Cash paid: |  |  |  |  |  |  |  |  |  |  |  |
Income taxes |  | $ | 238,615 |  |  | $ | 341,426 |  |  | $ | 322,018 |
Interest |  |  | 351,967 |  |  |  | 405,030 |  |  |  | 257,640 |
Non-cash investing and financing activities: |  |  |  |  |  |  |  |  |  |  |  |
Fixed assets under capital lease obligations |  |  | 72,389 |  |  |  | 60,920 |  |  |  | 55,813 |

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