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Supplemental cash flow information (Tables)
 12 Months Ended
Dec. 31, 2015
Supplemental Cash Flow Elements [Abstract]  
Supplemental Cash Flow Information

The table below provides supplemental cash flow information:

 

 

 

Year ended December 31,

 

 

 

2015

 

 

2014

 

 

2013

 

Cash paid:

 

 

 

 

 

 

 

 

 

 

 

 

Income taxes

 

$

156,075

 

 

$

238,615

 

 

$

341,426

 

Interest

 

 

405,120

 

 

 

351,967

 

 

 

405,030

 

Non-cash investing and financing activities:

 

 

 

 

 

 

 

 

 

 

 

 

Fixed assets under capital lease obligations

 

 

74,035

 

 

 

72,389

 

 

 

60,920