Noncontrolling Interests (Summary Of Changes In Controlling And Non-controlling Stockholders’ Equity) (Details) - USD ($) $ in Thousands		3 Months Ended			9 Months Ended
		Sep. 30, 2017	Sep. 30, 2016		Sep. 30, 2017	Sep. 30, 2016
Noncontrolling Interest [Line Items]
Balance	[1]				$ 146,615
Net income		$ 1,458	$ 3,917	[1]	23,553	$ 9,066	[1]
Distributions to noncontrolling stockholders					(240)	(194)	[1]
Accumulated other comprehensive income (loss)		(33)	(8)	[1]	(20)	(14)	[1]
Balance		174,795			174,795
Controlling Stockholders' Equity [Member]
Noncontrolling Interest [Line Items]
Balance					142,197	132,865
Net income					23,619	9,054
Increase in additional paid in capital					936	447
Treasury stock purchased					(6,475)
Contributions from noncontrolling stockholders - SHP
Distributions to noncontrolling stockholders
Accumulated other comprehensive income (loss)					10,323	9,414
Balance		170,600	151,780		170,600	151,780
Noncontrolling Stockholders' Equity [Member]
Noncontrolling Interest [Line Items]
Balance					4,418	4,331
Net income					(66)	12
Increase in additional paid in capital
Treasury stock purchased
Contributions from noncontrolling stockholders - SHP					63	268
Distributions to noncontrolling stockholders					(240)	(194)
Accumulated other comprehensive income (loss)					20	14
Balance		4,195	4,431		4,195	4,431
Total Stockholders' Equity [Member]
Noncontrolling Interest [Line Items]
Balance					146,615	137,196
Net income					23,553	9,066
Increase in additional paid in capital					936	447
Treasury stock purchased					(6,475)
Contributions from noncontrolling stockholders - SHP					63	268
Distributions to noncontrolling stockholders					(240)	(194)
Accumulated other comprehensive income (loss)					10,343	9,428
Balance		$ 174,795	$ 156,211		$ 174,795	$ 156,211

[1] Certain 2016 balances have been reclassified to conform to the 2017 presentation (see Note 2 - Summary of Significant Accounting Policies - Reclassifications).