Acquisitions, Goodwill And Other Intangible Assets (Schedule Of Business Acquisitions) (Details) - USD ($) $ in Thousands	1 Months Ended					3 Months Ended	6 Months Ended
	May 31, 2016	Feb. 29, 2016	Jan. 31, 2016	Apr. 30, 2015	Jan. 31, 2015	Dec. 31, 2014	Jun. 30, 2016	Jun. 30, 2015	May 01, 2016	Dec. 31, 2015	Apr. 30, 2014
Business Acquisition [Line Items]
Cash consideration net of cash acquired							$ 34,237	$ 25,058
Goodwill (tax deductible)							$ 93,831	$ 72,922		$ 83,619
Spectal Industries
Business Acquisition [Line Items]
Cash consideration				$ 22,335
Contingent consideration				1,211
Total fair value of consideration given				$ 23,546
Net tangible assets											$ 3,681
Total fair value of net assets acquired											14,481
Goodwill (tax deductible)											9,065
Project 2000
Business Acquisition [Line Items]
Cash consideration	$ 18,800
Cash consideration net of cash acquired	16,137
Contingent consideration	1,322
Total fair value of consideration given	$ 17,459
Net tangible assets									$ 128
Total fair value of net assets acquired									9,361
Goodwill (tax deductible)									8,098
Highwater Marine Furniture
Business Acquisition [Line Items]
Cash consideration			$ 10,000
Net tangible assets		$ 1,307
Total fair value of net assets acquired		9,407
Goodwill (tax deductible)		593
Flair Interiors
Business Acquisition [Line Items]
Cash consideration		8,100
Net other assets		2,279
Total fair value of net assets acquired					$ 6,279
Goodwill (tax deductible)		1,821
EA Technologies
Business Acquisition [Line Items]
Cash consideration					9,248	$ 6,600
Net tangible assets					8,868
Total fair value of net assets acquired					9,348
Gain on bargain purchase					100
Customer Relationships | Spectal Industries
Business Acquisition [Line Items]
Intangible assets, excluding goodwill											10,100
Customer Relationships | Project 2000
Business Acquisition [Line Items]
Intangible assets, excluding goodwill									6,925
Customer Relationships | Highwater Marine Furniture
Business Acquisition [Line Items]
Intangible assets, excluding goodwill		8,100
Customer Relationships | Flair Interiors
Business Acquisition [Line Items]
Intangible assets, excluding goodwill		$ 4,000
Customer Relationships | EA Technologies
Business Acquisition [Line Items]
Intangible assets, excluding goodwill					400
Other Intangible Assets | Spectal Industries
Business Acquisition [Line Items]
Intangible assets, excluding goodwill											$ 700
Other Intangible Assets | Project 2000
Business Acquisition [Line Items]
Intangible assets, excluding goodwill									$ 2,308
Other Intangible Assets | EA Technologies
Business Acquisition [Line Items]
Intangible assets, excluding goodwill					$ 80