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Stock-Based Compensation (Stock Units Rollforward) (Details) - $ / shares | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
RSUs |  |  |  |
Stock Units [Roll Forward] |  |  |  |
Outstanding at December 31, 2018 |  | 1,446,634 |  |
Granted |  | 679,601 | 465,378 | 438,521
Vested and distributed |  | (362,165) |  |
Forfeited |  | (47,625) |  |
Outstanding at December 31, 2019 |  | 1,716,445 | 1,446,634 |
Vested and deferred RSUs related to deferred compensation for non-employee directors | [1] | 512,525 |  |
Weighted Average Grant Date Fair Value [Roll Forward] |  |  |  |
Outstanding at December 31, 2018, Weighted Average Grant Date Fair Value |  | $ 10.72 |  |
Granted, Weighted Average Grant Date Fair Value |  | 8.74 | $ 12.71 | $ 12.65
Vested and Distributed, Weighted Average Grant Date Fair Value |  | 7.74 |  |
Forfeited, Weighted Average Grant Date Fair Value |  | 11.81 |  |
Outstanding at December 31, 2019, Weighted Average Grant Date Fair Value |  | 10.53 | $ 10.72 |
Weighted Average Grant Date Fair Value of Vested and Deferred RSUs |  | $ 9.37 |  |
PSUs |  |  |  |
Stock Units [Roll Forward] |  |  |  |
Outstanding at December 31, 2018 |  | 1,604,394 |  |
Granted |  | 895,389 | 747,996 | 706,732
Vested and distributed |  | (1,059,825) | (1,327,613) | (1,502,327)
Forfeited |  | (34,384) |  |
Other - decrease due to performance of PSUs |  | (384,031) |  |
Outstanding at December 31, 2019 |  | 1,021,543 | 1,604,394 |
Weighted Average Grant Date Fair Value [Roll Forward] |  |  |  |
Outstanding at December 31, 2018, Weighted Average Grant Date Fair Value |  | $ 9.46 |  |
Granted, Weighted Average Grant Date Fair Value |  | 8.35 | $ 12.82 | $ 12.75
Vested and Distributed, Weighted Average Grant Date Fair Value |  | 7.66 |  |
Forfeited, Weighted Average Grant Date Fair Value |  | 11.27 |  |
Other decrease due to performance of PSU's, Weighted Average Grant Date Fair Value |  | 10.32 |  |
Outstanding at December 31, 2019, Weighted Average Grant Date Fair Value |  | $ 9.98 | $ 9.46 |
[1] | Included in outstanding at December 31, 2019. Vested and deferred RSUs are primarily related to deferred compensation for non-employee directors.

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