Common Stock	12 Months Ended
Dec. 31, 2017
Equity [Abstract]
Common Stock	Note 13. Common Stock Share Repurchase Program Our Board of Directors approved various share repurchase programs that were effective during the years ended December 31, 2017, 2016 and 2015. Under these programs, shares may be purchased in the open market or in privately negotiated transactions according to SEC rules. The Share Repurchase Program (the “Share Repurchase Program”) does not obligate us to acquire any specific number of shares and may be suspended at any time. Repurchased shares are held in treasury and may be reserved for future use in connection with acquisitions, employee share plans and other general purposes. Under our credit facility, (described in Note 8, Debt and Financing Arrangements) share repurchases are unlimited when total leverage is less than 3.0. When leverage is greater than 3.0, the annual share repurchase is limited to $25 million. Under the Share Repurchase Program, we repurchased 1.2 million and 0.8 million shares on the open market at a cost (including fees and commissions) of $18.3 million and $7.8 million in December 31, 2017 and 2016, respectively. Shares repurchased to settle statutory employee withholding related to vesting of stock awards were 0.1 million shares at a cost of $1.4 million at December 31, 2017 and 2016.

Note 13. Common Stock

Share Repurchase Program

Our Board of Directors approved various share repurchase programs that were effective during the years ended December 31, 2017, 2016 and 2015. Under these programs, shares may be purchased in the open market or in privately negotiated transactions according to SEC rules.

The Share Repurchase Program (the “Share Repurchase Program”) does not obligate us to acquire any specific number of shares and may be suspended at any time. Repurchased shares are held in treasury and may be reserved for future use in connection with acquisitions, employee share plans and other general purposes. Under our credit facility, (described in Note 8, Debt and Financing Arrangements) share repurchases are unlimited when total leverage is less than 3.0. When leverage is greater than 3.0, the annual share repurchase is limited to $25 million.

Under the Share Repurchase Program, we repurchased 1.2 million and 0.8 million shares on the open market at a cost (including fees and commissions) of $18.3 million and $7.8 million in December 31, 2017 and 2016, respectively. Shares repurchased to settle statutory employee withholding related to vesting of stock awards were 0.1 million shares at a cost of $1.4 million at December 31, 2017 and 2016.