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Stock-Based Compensation (Stock Units Rollforward) (Details) - $ / shares		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
RSUs
Stock Units [Roll Forward]
Outstanding at December 31, 2019		1,716,445
Granted		724,319	679,601	465,378
Vested and distributed		(323,818)
Forfeited		(66,861)
Outstanding at December 31, 2020		2,050,085	1,716,445
Vested and deferred RSUs related to deferred compensation for non-employee directors	[1]	613,853
Weighted Average Grant Date Fair Value [Roll Forward]
Outstanding at December 31, 2019, Weighted Average Grant Date Fair Value		$ 10.53
Granted, Weighted Average Grant Date Fair Value		7.92	$ 8.74	$ 12.71
Vested and Distributed, Weighted Average Grant Date Fair Value		12.49
Forfeited, Weighted Average Grant Date Fair Value		10.20
Outstanding at December 31, 2020, Weighted Average Grant Date Fair Value		9.31	$ 10.53
Weighted Average Grant Date Fair Value of Vested and Deferred RSUs		$ 8.82
PSUs
Stock Units [Roll Forward]
Outstanding at December 31, 2019		1,021,543
Granted		939,529	895,389	747,996
Vested and distributed		(377,073)	(1,059,825)	(1,327,613)
Forfeited		(67,145)
Other - decrease due to performance of PSUs		(1,516,854)
Outstanding at December 31, 2020		0	1,021,543
Weighted Average Grant Date Fair Value [Roll Forward]
Outstanding at December 31, 2019, Weighted Average Grant Date Fair Value		$ 9.98
Granted, Weighted Average Grant Date Fair Value		8.25	$ 8.35	$ 12.82
Vested and Distributed, Weighted Average Grant Date Fair Value		12.75
Forfeited, Weighted Average Grant Date Fair Value		8.56
Other decrease due to performance of PSU's, Weighted Average Grant Date Fair Value		8.28
Outstanding at December 31, 2020, Weighted Average Grant Date Fair Value		$ 0	$ 9.98
[1] Included in outstanding at December 31, 2020. Vested and deferred RSUs are primarily related to deferred compensation for non-employee directors.

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