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Stockholders' Equity (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Oct. 21, 2016 | Mar. 31, 2017 | Mar. 31, 2016 | Dec. 31, 2016
Class of Stock [Line Items] |  |  |  |
Cash dividends to common stockholders |  | $ 1,655 | $ 1,518 | $ 6,223
Cash dividends paid per common share (usd per share) |  | $ 0.27 | $ 0.25 |
Dividends declared per common share (usd per share) | $ 0.27 |  |  |
Shares withheld for tax withholding and exercise of options |  | 4,715 |  |
Amount of shares withheld for tax withholding and exercise of options |  | $ 342 |  |
Shares withheld for tax withholding and exercise of options, weighted average price |  | $ 68.80 |  |
Performance-based stock awards |  |  |  |
Class of Stock [Line Items] |  |  |  |
Vesting period of performance-based stock awards |  | 3 years |  |
Performance-based stock awards | Minimum |  |  |  |
Class of Stock [Line Items] |  |  |  |
Vesting percentage of performance-based awards |  | 0.00% |  |
Performance-based stock awards | Maximum |  |  |  |
Class of Stock [Line Items] |  |  |  |
Vesting percentage of performance-based awards |  | 200.00% |  |

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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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