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Earnings per Share Earnings per Share (Details) - shares | 3 Months Ended
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Mar. 31, 2017 | Mar. 31, 2016
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] |  |
Weighted average common shares—basic | 45,570,495 | 45,278,990
Weighted average common shares—diluted | 45,908,958 | 45,654,816
Restricted Shares [Member] |  |
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] |  |
Incremental common shares attributable to share-based payment arrangements | 283,839 | 286,189
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 | 54,624 | 89,637

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