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Shareholders' Equity	9 Months Ended
	Sep. 30, 2018
Shareholders' Equity [Abstract]
Shareholders' Equity	7. Shareholders’ Equity The Company repurchased 60,000 and 1,060,000 shares of its common stock for an aggregate cost of $4.0 million and $76.7 million during the three and nine months ended September 30, 2018, respectively. The Company repurchased 505,085 and 839,734 shares of its common stock for an aggregate cost of $37.7 million and $64.5 million during the three and nine months ended September 30, 2017, respectively. The amounts related to treasury stock purchases reported in the Company’s Consolidated Condensed Statements of Cash Flows represent purchases that settled within each respective nine-month period.

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- Definition

The entire disclosure for treasury stock, including, but not limited to, average cost per share, description of share repurchase program, shares repurchased, shares held for each class of treasury stock.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 30
-URI http://asc.fasb.org/subtopic&trid=2208821

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