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Stockholders' Equity - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 14, 2016 | Feb. 05, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Stockholders' Equity Note [Abstract] |  |  |  |  |
Dividends paid per share (in dollars per share) |  |  | $ 1.12 | $ 1.00 | $ 0.80
Options vesting and exercisable period, maximum |  |  | 8 years |  |
Total intrinsic value of stock options exercised |  |  | $ 14,174 | $ 7,466 | $ 9,925
Total unrecognized stock-based compensation expense |  |  | $ 15,073 |  |
Weighted average period over which total unrecognized stock-based compensation expense will be recognized |  |  | 4 years 7 months 6 days |  |
Total grant date fair value of stock options vesting |  |  | $ 5,143 | 7,287 | 3,508
Total stock-based compensation expense |  |  | $ 5,841 | $ 7,039 | $ 5,400
Options termination period |  |  | 9 years |  |
Subsequent Event [Member] |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Dividend declared per share (in dollars per share) | $ 0.30 |  |  |  |
Purchases of common stock (in shares) |  | 1,600,000 |  |  |
Weighted Average [Member] | Subsequent Event [Member] |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Price of common stock purchased (in dollars per share) |  | $ 37.15 |  |  |

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- Definition Aggregate dividends paid during the period for each share of common stock outstanding. + 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 + Details
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- Definition Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern 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 04 -Article 3 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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