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Earnings Per Share Components of Earnings Per Share (Details) - shares shares in Thousands | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Earnings Per Share [Abstract] |  |
Weighted Average Number of Shares Outstanding, Basic and Diluted | 89,160 | 89,003

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- References No definition available. + Details
Name: | us-gaap_EarningsPerShareAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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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
Name: | us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration