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Supplemental cash flow information (Tables)

12 Months Ended

Dec. 31, 2013

The table below provides supplemental cash flow information:


	Year ended December 31,
	2013		2012		2011
Cash paid:
Income taxes	$	341,426	$	322,018	$	145,687
Interest		405,030		257,640		236,446
Non-cash investing and financing activities:
Fixed assets under capital lease obligations		60,920		55,813		35,764