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 | |||