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Stock Repurchase Program (Details) - USD ($) $ in Millions | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Mar. 31, 2018 | Feb. 28, 2017 | Feb. 29, 2016 | Dec. 31, 2014 | Dec. 31, 2012
July 2012 Plan |  |  |  |  |  |  |  |
Class of Stock |  |  |  |  |  |  |  |
Stock repurchased program authorized number of shares (in shares) |  |  |  |  |  |  |  | 1,000,000
January 2014 Plan |  |  |  |  |  |  |  |
Class of Stock |  |  |  |  |  |  |  |
Stock repurchased program authorized number of shares (in shares) |  |  |  |  |  |  | 500,000 |
2012 And 2014 Plan |  |  |  |  |  |  |  |
Class of Stock |  |  |  |  |  |  |  |
Stock repurchase program, remaining number of shares authorized to be repurchased (in shares) |  |  | 56,000 |  |  |  | 268,000 |
2012 And 2014 Plan | Treasury Stock |  |  |  |  |  |  |  |
Class of Stock |  |  |  |  |  |  |  |
Stock repurchased during period (in shares) |  |  | 212,000 |  |  |  |  |
Aggregate purchase price of shares repurchased |  |  | $ 1.7 |  |  |  |  |
February 2016 Plan |  |  |  |  |  |  |  |
Class of Stock |  |  |  |  |  |  |  |
Stock repurchased program authorized number of shares (in shares) |  |  |  |  |  | 1,000,000 |  |
February 2016 Plan | Treasury Stock |  |  |  |  |  |  |  |
Class of Stock |  |  |  |  |  |  |  |
Stock repurchased during period (in shares) |  | 1,056,000 |  |  |  |  |  |
Aggregate purchase price of shares repurchased |  | $ 9.5 |  |  |  |  |  |
February 2017 Plan |  |  |  |  |  |  |  |
Class of Stock |  |  |  |  |  |  |  |
Stock repurchased program authorized number of shares (in shares) |  |  |  |  | 1,000,000 |  |  |
February 2017 Plan | Treasury Stock |  |  |  |  |  |  |  |
Class of Stock |  |  |  |  |  |  |  |
Stock repurchased during period (in shares) | 1,000,000 |  |  |  |  |  |  |
Aggregate purchase price of shares repurchased | $ 9.7 |  |  |  |  |  |  |
Subsequent Event | March 2018 Plan |  |  |  |  |  |  |  |
Class of Stock |  |  |  |  |  |  |  |
Stock repurchased program authorized number of shares (in shares) |  |  |  | 500,000 |  |  |  |

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- Definition The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan. + References No definition available. + Details
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- Definition Number of shares that have been repurchased and retired during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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