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Supplemental Cash Flow Information
12 Months Ended
Dec. 31, 2013
Supplemental Cash Flow Elements [Abstract]  
Supplemental Cash Flow Information

Cash paid for interest totaled $5.2 million, $5.1 million and $4.8 million for the years ended December 31, 2011, 2012 and 2013, respectively. Cash paid for income taxes totaled $75.6 million, $95.2 million and $130.1 million for the years ended December 31, 2011, 2012 and 2013, respectively. There was a non-cash item for the year ended December 31, 2012 of $7.0 million in deferred tax liabilities and intangibles in conjunction with the NOX Technologies, Inc. acquisition. For the years ended December 31, 2012 and 2013, there were non-cash additions of fixed assets of $5.5 million and $9.2 million, respectively, associated with the construction of the Company's worldwide headquarters.
 
18.            Segment Information