Long-term Incentive Plan (Schedule of compensation expense related to stock awards) (Details) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
|
| RSUs Redeemable in Stocks | |||
| Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] | |||
| Share-based compensation expense | $ 640 | $ 605 | $ 702 |
| RSUs Redeemable in Cash | |||
| Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] | |||
| Share-based compensation expense | 580 | (349) | 1,117 |
| RSUs | |||
| Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] | |||
| Share-based compensation expense | $ 1,220 | $ 256 | $ 1,819 |