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Common Stock - Stock Repurchase Program (Details) - USD ($) | 3 Months Ended | 9 Months Ended | 16 Months Ended |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Jun. 30, 2015 | Nov. 30, 2012
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |
Repurchase of common stock |  |  | $ 925,000 |  |  |  |
Stock repurchase program, remaining amount | $ 54,900,000 |  | 54,900,000 |  | $ 54,900,000 |  |
Credit Facility |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |
Share repurchase covenant |  |  | $ 4,900,000 |  |  |  |
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 during period (in shares) | 0 | 2,404 | 0 | 549,723 |  |  |
Repurchase of common stock (in dollars per share) |  | $ 16.44 |  | $ 13.28 |  |  |
Repurchase of common stock |  |  |  | $ 7,300,000 |  |  |
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 during period (in shares) |  |  |  |  | 0 |  |

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- Definition Total cost of shares repurchased divided by the total number of shares repurchased. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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