Equity Compensation Plans (Schedule of Weighted Average Grant Date Fair Value) (Details) - Unvested restricted shares - USD ($) $ / shares in Units, $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
| Weighted average grant date fair value (in dollars per share) | $ 2.40 | $ 5.85 | $ 1.30 |
| Grant date fair value of stock options vested | $ 3,794 | $ 3,497 | $ 2,725 |