Net Income Per Common Share	9 Months Ended
Sep. 30, 2016
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 was increased by 366,251 and 388,777 for the three-month periods ended September 30, 2016 and 2015, respectively, and by 436,941 and 507,197 for the nine-month periods ended September 30, 2016 and 2015, 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, 2016 and 2015, the Company excluded 209,907 and 209,102 stock options, respectively, from the calculation of weighted-average diluted shares outstanding as the stock options would have been anti-dilutive. During the nine- month periods ended September 30, 2016 and 2015, the Company excluded 315,440 and 203,001 stock options, respectively, from the calculation of weighted-average diluted shares outstanding as the stock options would have been anti-dilutive. The Company also excluded 31,028 performance share awards from the calculation of weighted-average diluted shares outstanding during the nine- month period ended September 30, 2016 as such awards also would have been anti-dilutive. There were no performance share awards excluded from the calculation of weighted-average diluted shares outstanding during the three- month period ended September 30, 2016 as no awards would have been anti-dilutive. The Company granted 142,000 stock options, 119,814 restricted stock unit awards and 108,400 performance share awards ("PSAs") in February 2016 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 performance share awards 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 2015 include the Company’s total shareholder return (“TSR”), return on invested capital (“ROIC”) and operating income before depreciation and amortization growth. The metrics for the awards granted in 2016 include TSR and ROIC. The TSR and operating income before depreciation and amortization growth metrics are 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 was increased by 366,251 and 388,777 for the three-month periods ended September 30, 2016 and 2015, respectively, and by 436,941 and 507,197 for the nine-month periods ended September 30, 2016 and 2015, 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, 2016 and 2015, the Company excluded 209,907 and 209,102 stock options, respectively, from the calculation of weighted-average diluted shares outstanding as the stock options would have been anti-dilutive. During the nine- month periods ended September 30, 2016 and 2015, the Company excluded 315,440 and 203,001 stock options, respectively, from the calculation of weighted-average diluted shares outstanding as the stock options would have been anti-dilutive. The Company also excluded 31,028 performance share awards from the calculation of weighted-average diluted shares outstanding during the nine- month period ended September 30, 2016 as such awards also would have been anti-dilutive. There were no performance share awards excluded from the calculation of weighted-average diluted shares outstanding during the three- month period ended September 30, 2016 as no awards would have been anti-dilutive.

The Company granted 142,000 stock options, 119,814 restricted stock unit awards and 108,400 performance share awards ("PSAs") in February 2016 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 performance share awards 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 2015 include the Company’s total shareholder return (“TSR”), return on invested capital (“ROIC”) and operating income before depreciation and amortization growth. The metrics for the awards granted in 2016 include TSR and ROIC. The TSR and operating income before depreciation and amortization growth metrics are 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.