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Subsequent Events | 3 Months Ended
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Mar. 31, 2018
Subsequent Events [Abstract] |
Subsequent Events, Policy [Policy Text Block] | Subsequent Events No events occurred requiring disclosure other than the repurchase of an additional 0.9 million shares of our common stock for $16.6 million subsequent to March 31, 2018 through May 10, 2018.

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- Definition Disclosure of accounting policy for reporting subsequent events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84158767&loc=d3e18780-107790 + Details
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