Noncontrolling Interests (Summary Of Changes In Controlling And Non-controlling Stockholders’ Equity) (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Noncontrolling Interest [Line Items]
Balance	[1]			$ 146,615
Net income		$ 19,052	$ 2,922	22,095	$ 5,149	[1]
Distributions to noncontrolling stockholders				(133)	(124)	[1]
Accumulated other comprehensive income (loss)			10	(13)	(6)
Balance		174,340		174,340
Controlling Stockholders' Equity [Member]
Noncontrolling Interest [Line Items]
Balance				142,197	132,865
Net income				22,063	5,199
Increase in additional paid in capital				610	340
Treasury stock purchased				(3,400)
Contributions from noncontrolling stockholders - SHP
Distributions to noncontrolling stockholders
Accumulated other comprehensive income (loss)				8,489	4,326
Balance		169,959	142,730	169,959	142,730
Noncontrolling Stockholders' Equity [Member]
Noncontrolling Interest [Line Items]
Balance				4,418	4,331
Net income				32	(50)
Increase in additional paid in capital
Treasury stock purchased
Contributions from noncontrolling stockholders - SHP				49	84
Distributions to noncontrolling stockholders				(131)	(125)
Accumulated other comprehensive income (loss)				13	6
Balance		4,381	4,246	4,381	4,246
Total Stockholders' Equity [Member]
Noncontrolling Interest [Line Items]
Balance				146,615	137,196
Net income				22,095	5,149
Increase in additional paid in capital				610	340
Treasury stock purchased				(3,400)
Contributions from noncontrolling stockholders - SHP				49	84
Distributions to noncontrolling stockholders				(131)	(125)
Accumulated other comprehensive income (loss)				8,502	4,332
Balance		$ 174,340	$ 146,976	$ 174,340	$ 146,976

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