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Common Stock - Stock Repurchase Program (Details) - USD ($) | 3 Months Ended | 34 Months Ended | 65 Months Ended |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2018 | Mar. 31, 2018 | Jun. 30, 2015 | Nov. 30, 2012
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Stock repurchase program, remaining amount | $ 49,700,000 |  | $ 49,700,000 | $ 49,700,000 |  |
Credit Facility |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Share repurchase covenant | $ 9,700,000 |  |  |  |  |
Share Repurchase Program, November 2012 |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Stock repurchase program, authorized amount (up to) |  |  |  |  |  | $ 25,000,000
Repurchase of common stock |  |  |  | $ 25,000,000 |  |
Repurchase of common stock during period (in shares) | 0 | 0 |  |  |  |
Share Repurchase Program, June 2015 |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Stock repurchase program, authorized amount (up to) |  |  |  |  | $ 50,000,000 |
Repurchase of common stock |  |  | $ 300,000 |  |  |

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- Definition Number of shares that have been repurchased during the period and are being held in treasury. + 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 + Details
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