Net Income Per Common Share	9 Months Ended
Sep. 30, 2017
Earnings Per Share [Abstract]
Net Income Per Common Share	Net Income Per Common Share For the purpose of computing diluted net income per common share, the weighted-average number of common shares outstanding is increased for the potential dilutive effects of stock-based incentive plans. For the purpose of computing diluted net income per common share, the weighted-average number of common shares outstanding increased by 504,168 and 366,251 for the three-month periods ended September 30, 2017 and 2016, respectively, and by 509,172 and 436,941 for the nine-month periods ended September 30, 2017 and 2016, respectively, to account for the potential dilutive effect of stock-based incentive plans. There were no adjustments to net income for the purposes of computing income available to common stockholders for the periods. The calculation of weighted-average diluted shares outstanding excludes all shares that would have been anti-dilutive. During the three-month periods ended September 30, 2017 and 2016, the Company excluded 0 and 209,907 stock awards, respectively, from the calculation of weighted-average diluted shares outstanding as the stock awards were considered anti-dilutive. During the nine-month periods ended September 30, 2017 and 2016, the Company excluded 59,261 and 346,468 stock awards, respectively, from the calculation of weighted-average diluted shares outstanding as the stock awards were considered anti-dilutive. The Company granted 125,300 stock options, 85,307 restricted stock unit awards and 83,970 performance share awards ("PSAs") in February 2017 as part of its annual grant awards. All of the stock options and the restricted stock unit awards vest upon meeting certain service conditions. The restricted stock unit awards are included in basic weighted-average common shares outstanding as they contain nonforfeitable rights to dividend payments. The PSAs are part of the long-term Performance Share Award Program (the "Awards Program") and are based on performance goals that are driven by a combination of independently measured metrics (depending on the grant year) with each metric being weighted equally. The metrics for awards granted in 2016 and 2017 include the Company’s total shareholder return (“TSR”) and return on invested capital (“ROIC”). The TSR metric is designed to assess the long-term Company performance relative to the performance of companies included in the Russell 2000 Index over a three-year performance period. The ROIC metric is measured based on pre-established Company targets over the same period. The participants can earn from zero to 250% of the target award and the award includes a forfeitable right to dividend equivalents, which are not included in the aggregate target award numbers. The fair value of the TSR portion of the PSA was determined using a Monte Carlo valuation method as the award contains a market condition.

Net Income Per Common Share

For the purpose of computing diluted net income per common share, the weighted-average number of common shares outstanding is increased for the potential dilutive effects of stock-based incentive plans. For the purpose of computing diluted net income per common share, the weighted-average number of common shares outstanding increased by 504,168 and 366,251 for the three-month periods ended September 30, 2017 and 2016, respectively, and by 509,172 and 436,941 for the nine-month periods ended September 30, 2017 and 2016, respectively, to account for the potential dilutive effect of stock-based incentive plans. There were no adjustments to net income for the purposes of computing income available to common stockholders for the periods.

The calculation of weighted-average diluted shares outstanding excludes all shares that would have been anti-dilutive. During the three-month periods ended September 30, 2017 and 2016, the Company excluded 0 and 209,907 stock awards, respectively, from the calculation of weighted-average diluted shares outstanding as the stock awards were considered anti-dilutive. During the nine-month periods ended September 30, 2017 and 2016, the Company excluded 59,261 and 346,468 stock awards, respectively, from the calculation of weighted-average diluted shares outstanding as the stock awards were considered anti-dilutive.

The Company granted 125,300 stock options, 85,307 restricted stock unit awards and 83,970 performance share awards ("PSAs") in February 2017 as part of its annual grant awards. All of the stock options and the restricted stock unit awards vest upon meeting certain service conditions. The restricted stock unit awards are included in basic weighted-average common shares outstanding as they contain nonforfeitable rights to dividend payments. The PSAs are part of the long-term Performance Share Award Program (the "Awards Program") and are based on performance goals that are driven by a combination of independently measured metrics (depending on the grant year) with each metric being weighted equally. The metrics for awards granted in 2016 and 2017 include the Company’s total shareholder return (“TSR”) and return on invested capital (“ROIC”). The TSR metric is designed to assess the long-term Company performance relative to the performance of companies included in the Russell 2000 Index over a three-year performance period. The ROIC metric is measured based on pre-established Company targets over the same period. The participants can earn from zero to 250% of the target award and the award includes a forfeitable right to dividend equivalents, which are not included in the aggregate target award numbers. The fair value of the TSR portion of the PSA was determined using a Monte Carlo valuation method as the award contains a market condition.