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Shareholders' Equity
3 Months Ended
Mar. 31, 2018
Shareholders' Equity [Abstract]  
Shareholders' Equity
7.
Shareholders’ Equity

The Company repurchased 1 million shares of its common stock for an aggregate cost of $72.7 million during the three months ended March 31, 2018, and 155,849 shares of its common stock for an aggregate cost of $12.4 million during the three months ended March 31, 2017. The amount of treasury stock purchases reported in the Company’s Consolidated Condensed Statements of Cash Flow represent purchases that have settled within each respective three-month period.