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Stockholders' Equity (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Apr. 26, 2016
Stockholders Equity [Line Items] |  |  |  |
Dividends declared, per share |  | $ 0.50 |  |
Common stock dividends declared, quarterly |  | $ 0.125 |  |
Payments of Dividends | $ 0 | $ 25,434 | $ 25,039 |
Beneficial Ownership Percentage Limit | 4.90% |  |  |
2013 Stock Plan [Member] |  |  |  |
Stockholders Equity [Line Items] |  |  |  |
Number of shares available for grant |  |  |  | 625,390

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