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Subsequent Events | 6 Months Ended
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Jun. 30, 2018
Subsequent Events [Abstract] |
Subsequent Events, Policy [Policy Text Block] | Subsequent Events No events occurred requiring disclosure other than the repurchase of an additional 0.2 million shares of our common stock for $4.2 million subsequent to June 30, 2018.

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- Definition Disclosure of accounting policy for reporting subsequent events. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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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