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Earnings per Share Earnings per Share (Details) - shares | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] |  |
Weighted average common shares—basic | 45,578,815 | 45,779,966
Weighted average common shares—diluted | 45,992,182 | 46,229,337
Restricted Stock Units (RSUs) [Member] |  |
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] |  |
Incremental common shares attributable to share-based payment arrangements | 333,020 | 358,583
Stock Options [Member] |  |
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] |  |
Incremental common shares attributable to share-based payment arrangements | 80,347 | 90,788

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