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Supplemental Cash Flow Information
 12 Months Ended
Dec. 31, 2017
Supplemental Cash Flow Information [Abstract]  
Supplemental Cash Flow Information
Supplemental Cash Flow Information

The supplemental cash flow information consists of the following (in thousands): 
 
Year Ended December 31,
 
2017
 
2016
 
2015
Taxes paid
$
51,231

 
$
47,289

 
$
40,621

Non-cash investing activities:
 
 
 
 
 
Fixed assets acquired with accounts payable or accrued liabilities
$
15,105

 
$
4,434

 
$
14,636

             Fair value of option to purchase property
$
3,936

 
$
—

 
$
—