Stockholders' Equity - Summary of Dividends Declared (Footnote) (Details) - USD ($) $ in Thousands |
3 Months Ended | 9 Months Ended |
|---|---|---|
Sep. 30, 2015 |
Sep. 30, 2015 |
|
| Equity [Abstract] | ||
| Estimated forfeitures for dividends declared on employee restricted stock awards | $ 1 | $ 9 |