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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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