Noncontrolling Interests (Summary Of Changes In Controlling And Non-controlling Stockholders’ Equity) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Noncontrolling Interest [Line Items]
Balance			$ 181,618	$ 146,890
Net income	$ 1,259	$ 1,479	9,493	23,611
Distributions to noncontrolling stockholders			(117)	(240)
Accumulated other comprehensive income (loss)	5	(33)	15	(20)
Balance	179,863	175,128	179,863	175,128
Controlling Stockholders' Equity [Member]
Noncontrolling Interest [Line Items]
Balance			177,287	142,472
Adjustments to opening retained earnings on adoption of ASC 606					$ 194
Net income			9,405	23,677
Increase in additional paid in capital			1,162	936
Treasury stock purchased			(397)	(6,475)
Contributions from noncontrolling stockholders
Distributions to noncontrolling stockholders
Accumulated other comprehensive income (loss)			(12,148)	10,323
Balance	175,503	170,933	175,503	170,933
Noncontrolling Stockholders' Equity [Member]
Noncontrolling Interest [Line Items]
Balance			4,331	4,418
Adjustments to opening retained earnings on adoption of ASC 606					(2)
Net income			88	(66)
Increase in additional paid in capital
Treasury stock purchased
Contributions from noncontrolling stockholders			75	63
Distributions to noncontrolling stockholders			(117)	(240)
Accumulated other comprehensive income (loss)			(15)	20
Balance	4,360	4,195	4,360	4,195
Total Stockholders' Equity [Member]
Noncontrolling Interest [Line Items]
Balance			181,618	146,890
Adjustments to opening retained earnings on adoption of ASC 606					$ 192
Net income			9,493	23,611
Increase in additional paid in capital			1,162	936
Treasury stock purchased			(397)	(6,475)
Contributions from noncontrolling stockholders			75	63
Distributions to noncontrolling stockholders			(117)	(240)
Accumulated other comprehensive income (loss)			(12,163)	10,343
Balance	$ 179,863	$ 175,128	$ 179,863	$ 175,128