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Stock Repurchase Program (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Feb. 28, 2017 | Feb. 29, 2016 | Jan. 31, 2014
January 2014 Plan |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Number of shares authorized to be repurchased (up to) (in shares) |  |  |  |  |  |  |  | 500,000
Remaining number of shares authorized to be repurchased (in shares) |  |  |  | 56,000 |  |  |  |
January 2014 Plan | Treasury Stock |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Shares repurchase and retired during period (in shares) |  |  |  | 212,000 | 261,000 |  |  |
Stock repurchased during period, value |  |  |  | $ 1.7 | $ 5.9 |  |  |
February 2016 Plan |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Number of shares authorized to be repurchased (up to) (in shares) |  |  |  |  |  |  | 1,000,000 |
Remaining number of shares authorized to be repurchased (in shares) |  |  | 56,000 |  |  |  |  |
February 2016 Plan | Treasury Stock |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Shares repurchase and retired during period (in shares) |  |  | 1,056,000 |  |  |  |  |
Stock repurchased during period, value |  |  | $ 9.5 |  |  |  |  |
January 2014 and February 2016 Plan |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Remaining number of shares authorized to be repurchased (in shares) |  |  | 0 |  |  |  |  |
February 2017 Plan |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Number of shares authorized to be repurchased (up to) (in shares) |  |  |  |  |  | 1,000,000 |  |
Remaining number of shares authorized to be repurchased (in shares) | 3,295 | 3,295 |  |  |  |  |  |
February 2017 Plan | Treasury Stock |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Shares repurchase and retired during period (in shares) | 287,713 | 996,705 |  |  |  |  |  |
Stock repurchased during period, value | $ 2.6 | $ 9.7 |  |  |  |  |  |

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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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