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Treasury Stock	12 Months Ended
	Dec. 31, 2016
Equity [Abstract]
Treasury Stock	Treasury Stock At December 31, 2016, common shares held in treasury totaled 759,929 with a cost of $12.6 million. At December 31, 2015, common shares held in treasury totaled 514,812 with a cost of $9.3 million. These shares were withheld from employees to settle personal tax withholding obligations that arose as a result of restricted stock units that vested.

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- Definition

The entire disclosure for treasury stock, including, but not limited to, average cost per share, description of share repurchase program, shares repurchased, shares held for each class of treasury stock.

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