Earnings Per Common Share (Computation Of Basic And Diluted Loss Per Common Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Earnings Per Common Share [Abstract]
Net income	$ 8,589	$ 26,500	$ (7,624)	$ 4,638	$ 15,667	$ 11,985	$ 12,439	$ 15,702	$ 32,103	$ 55,793	$ 102,303
Less: Net income attributable to noncontrolling interests	3,137	4,112	4,024	3,139	4,367	5,806	5,958	4,560	14,412	20,691	18,378
Net income attributable to shareholders	$ 5,452	$ 22,388	$ (11,648)	$ 1,499	$ 11,300	$ 6,179	$ 6,481	$ 11,142	$ 17,691	$ 35,102	$ 83,925
Basic weighted average number of common shares outstanding	91,497	92,587	93,207	93,220	94,042	93,193	94,390	99,652	92,628	95,298	98,745
Basic earnings per common shares	$ 0.06	$ 0.24	$ (0.12)	$ 0.02	$ 0.12	$ 0.07	$ 0.07	$ 0.11	$ 0.19	$ 0.37	$ 0.85
Effect of dilutive restricted stock awards									1,026	2,562	5,171
Diluted weighted average number of common shares outstanding	91,572	94,059	93,207	94,487	95,041	96,576	97,779	102,628	93,654	97,860	103,916
Diluted earnings per common share	$ 0.06	$ 0.24	$ (0.12)	$ 0.02	$ 0.12	$ 0.06	$ 0.07	$ 0.11	$ 0.19	$ 0.36	$ 0.81