Stock-Based Compensation (Activity Pertaining To Restricted Stock Awards) (Details) - $ / shares	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Restricted Stock - Employee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares, beginning balance	1,877,008	1,363,987	1,301,865
Weighted average price, beginning balance	$ 19.70	$ 21.25	$ 23.32
Number of shares, granted	1,427,429	1,234,943	659,172
Weighted average price, granted	$ 16.09	$ 20.52	$ 26.07
Number of shares, vested	(803,942)	(679,814)	(517,689)
Weighted average price, vested	$ 15.56	$ 24.30	$ 29.87
Number of shares, forfeited	(131,473)	(42,108)	(79,361)
Weighted average price, forfeited	$ 19.36	$ 19.80	$ 38.87
Number of shares, ending balance	2,369,022	1,877,008	1,363,987
Weighted average price, ending balance	$ 18.95	$ 19.70	$ 21.25
Restricted Stock - Non-employee Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares, beginning balance	107,045	117,714	111,816
Weighted average price, beginning balance	$ 17.07	$ 16.03	$ 17.21
Number of shares, granted	72,784	44,312	49,104
Weighted average price, granted	$ 12.09	$ 19.86	$ 17.92
Number of shares, vested	(61,141)	(54,981)	(43,206)
Weighted average price, vested	$ 15.49	$ 17.08	$ 21.24
Number of shares, forfeited	0	0	0
Weighted average price, forfeited	$ 0	$ 0	$ 0
Number of shares, ending balance	118,688	107,045	117,714
Weighted average price, ending balance	$ 14.83	$ 17.07	$ 16.03
Time Vested \| Restricted Stock - Employee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares, beginning balance	1,268,883	915,558	929,737
Number of shares, granted	927,173	844,498	485,799
Number of shares, vested	(570,107)	(470,171)	(455,570)
Number of shares, forfeited	(98,301)	(21,002)	(44,408)
Number of shares, ending balance	1,527,648	1,268,883	915,558
Performance Shares \| Restricted Stock - Employee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares, beginning balance	608,125	448,429	372,128
Number of shares, granted	500,256	390,445	173,373
Number of shares, vested	(233,835)	(209,643)	(62,119)
Number of shares, forfeited	(33,172)	(21,106)	(34,953)
Number of shares, ending balance	841,374	608,125	448,429

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(3)
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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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