Long-term Incentive Plan (Schedule of stock options outstanding activity) (Details) |
12 Months Ended |
|---|---|
|
Dec. 31, 2016
$ / shares
shares
| |
| Stock option activity rollforward | |
| Number of Options, Outstanding, Beginning Balance | shares | 259,311 |
| Number of Options Exercised | shares | (85,926) |
| Number of Options Canceled | shares | (58,406) |
| Number of Options, Outstanding, Ending Balance | shares | 114,979 |
| Weighted average price per share | |
| Weighted Average Exercise Price, Outstanding Beginning Balance | $ / shares | $ 8.37 |
| Weighted Average Exercise Price, Exercised | $ / shares | 1.81 |
| Weighted Average Exercise Price, Canceled | $ / shares | 18.33 |
| Weighted Average Exercise Price, Outstanding Ending Balance | $ / shares | $ 8.21 |