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Stock Repurchases - Additional Information (Details) - USD ($) $ / shares in Units, shares in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended | 29 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2015 | Aug. 31, 2015 | Jun. 30, 2015 | May. 31, 2015 | Mar. 31, 2015 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2014 | Nov. 30, 2014 | Aug. 31, 2012
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total number of shares repurchased | 554 | 189 | 360 | 321 |  | 1,424 | 884 | 885 |  |  |
Dollar amount of shares repurchased | $ 18,622,000 | $ 6,378,000 | $ 13,493,000 | $ 11,528,000 |  | $ 50,021,000 | $ 24,091,000 | $ 20,962,000 |  |  |
Average price paid per share | $ 33.61 | $ 33.75 | $ 37.48 | $ 35.91 |  | $ 35.13 | $ 27.24 | $ 23.70 |  |  |
August 2012 Stock Repurchase Program |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stock repurchases program, authorized amount |  |  |  |  |  |  |  |  |  |  | $ 50,000,000.0
Stock repurchases program, amount repurchased |  |  |  |  | $ 4,900,000 |  |  |  | $ 45,100,000 |  |
November 2014 Stock Repurchase Program |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stock repurchases program, authorized amount |  |  |  |  |  |  |  |  |  | $ 50,000,000 |
Stock repurchases program, amount repurchased |  |  |  |  |  |  |  |  | $ 45,100,000 |  |
Stock repurchase program, remaining authorized repurchase amount |  |  |  |  |  | $ 4,900,000 |  |  |  |  |

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- Definition Amount remaining of a stock repurchase plan authorized. + References No definition available. + 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 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 + Details
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