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Stockholders' Equity - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  | 12 Months Ended | 105 Months Ended
--- | --- | --- | --- | ---
Jan. 17, 2017 | Jan. 03, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2016
Stockholders' Equity Note [Abstract] |  |  |  |  |  |
Dividends paid (in dollars per share) |  |  | $ 1.20 | $ 1.12 | $ 1.00 |
Options vesting and exercisable period, maximum |  |  | 8 years |  |  |
Total intrinsic value of stock options exercised |  |  | $ 23,236 | $ 14,174 | $ 7,466 |
Total unrecognized stock-based compensation expense |  |  | $ 14,455 |  |  | $ 14,455
Weighted average period over which total unrecognized stock-based compensation expense will be recognized |  |  | 4 years 6 months 21 days |  |  |
Total grant date fair value of stock options vested |  |  | $ 7,083 | 5,143 | 7,287 |
Total stock-based compensation expense |  |  | $ 4,100 | $ 5,841 | $ 7,039 |
Options termination period |  |  | 9 years |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Options Granted (in shares) |  |  |  |  |  | 6,413,660
Subsequent Event [Member] |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Dividend declared (in dollars per share) | $ 0.32 |  |  |  |  |
Options Granted (in shares) |  | 764,789 |  |  |  |
Option Exercise (Strike) Price (in dollars per share) |  | $ 47.00 |  |  |  |
Closing Stock Price on Date of Grant (in dollars per share) |  | $ 46.95 |  |  |  |

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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 Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 + Details
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- Definition Net number of share options (or share units) granted during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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