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Treasury Stock | 12 Months Ended
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Dec. 31, 2017
Equity [Abstract] |
Treasury Stock | Treasury Stock From time to time, our Board of Directors authorizes management to repurchase shares of our issued and outstanding common stock. As of December 31, 2017, we had no shares available for repurchase under the Board's authorizations. Repurchased shares of our common stock were as follows:
| Year Ended December 31,
(In thousands) | 2017 |  | 2016 |  | 2015
Shares repurchased | 680 |  |  | 198 |  |  | 1,817 |
Cost of shares repurchased | $ | 39,085 |  |  | $ | 12,647 |  |  | $ | 89,395 |
Repurchased shares are recorded as shares held in treasury at cost. We hold these shares for future use as management and the Board of Directors deem appropriate.

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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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -URI http://asc.fasb.org/subtopic&trid=2208821 + Details
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