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Earnings per Share Earnings per Share (Details) - shares | 3 Months Ended | 9 Months Ended
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Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] |  |  |  |
Weighted average common shares—basic | 45,435,936 | 45,157,412 | 45,381,592 | 45,102,067
Weighted average common shares—diluted | 45,760,455 | 45,499,104 | 45,713,873 | 45,439,618
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 | 244,757 | 216,642 | 248,942 | 218,949
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 | 79,762 | 125,050 | 83,339 | 118,602

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