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Earnings Per Share Components of Earnings Per Share (Details) - shares shares in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Earnings Per Share [Abstract] |  |  |  |
Weighted Average Number of Shares Outstanding, Basic and Diluted | 89,215 | 89,063 | 89,188 | 89,033

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- References No definition available. + Details
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- Definition Average number of shares or units issued and outstanding that are used in calculating basic and diluted earnings per share (EPS). + References No definition available. + Details
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