Nature Of Operations And Accounting Policies (Schedule Of Intangible Assets) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross, Beginning Balance	$ 33,216	$ 63,888
Acquired intangible assets	(7,098)	(3,157)
Foreign currency translation	9	(78)
Impairment of Intangible Assets, Finite-lived	(10,944)
Finite-Lived Intangible Assets, Period Increase (Decrease)	(432)	(27,437)
Intangible Assets, Gross, Ending Balance	28,947	33,216	$ 63,888
Accumulated Amortization, Beginning Balance	6,824	31,161
Amortization expense	2,477	3,100	4,300
Fully amortized intangible assets, Accumulated Amortization	432	27,437
Accumulated Amortization, Ending Balance	$ 8,869	6,824	31,161
Weighted average remaining contractual life, in years	8 years 219 days
Trademark/Tradenames
Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross, Beginning Balance	$ 4,920	10,681
Acquired intangible assets	0	(1,024)
Foreign currency translation	0	0
Impairment of Intangible Assets, Finite-lived	(1,596)
Finite-Lived Intangible Assets, Period Increase (Decrease)	0	(4,737)
Intangible Assets, Gross, Ending Balance	3,324	4,920	10,681
Accumulated Amortization, Beginning Balance	1,316	5,429
Amortization expense	332	624
Fully amortized intangible assets, Accumulated Amortization	0	4,737
Accumulated Amortization, Ending Balance	$ 1,648	1,316	5,429
Weighted average remaining contractual life, in years	5 years
Customer Relationships
Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross, Beginning Balance	$ 23,737	48,570
Acquired intangible assets	(1,598)	(2,133)
Foreign currency translation	0	0
Impairment of Intangible Assets, Finite-lived	(8,128)
Finite-Lived Intangible Assets, Period Increase (Decrease)	0	(22,700)
Intangible Assets, Gross, Ending Balance	17,207	23,737	48,570
Accumulated Amortization, Beginning Balance	4,022	24,179
Amortization expense	1,687	2,543
Fully amortized intangible assets, Accumulated Amortization	0	22,700
Accumulated Amortization, Ending Balance	$ 5,709	4,022	24,179
Weighted average remaining contractual life, in years	9 years 88 days
Software/Technology
Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross, Beginning Balance	$ 1,652	1,652
Acquired intangible assets	0	0
Foreign currency translation	0	0
Impairment of Intangible Assets, Finite-lived	(1,220)
Finite-Lived Intangible Assets, Period Increase (Decrease)	(432)	0
Intangible Assets, Gross, Ending Balance	0	1,652	1,652
Accumulated Amortization, Beginning Balance	288	96
Amortization expense	144	192
Fully amortized intangible assets, Accumulated Amortization	432	0
Accumulated Amortization, Ending Balance	$ 0	288	96
Weighted average remaining contractual life, in years	1 day
Acquired Contractual Rights
Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross, Beginning Balance	$ 2,907	2,985
Acquired intangible assets	(5,500)	0
Foreign currency translation	9	(78)
Impairment of Intangible Assets, Finite-lived	0
Finite-Lived Intangible Assets, Period Increase (Decrease)	0	0
Intangible Assets, Gross, Ending Balance	8,416	2,907	2,985
Accumulated Amortization, Beginning Balance	1,198	1,457
Amortization expense	314	(259)
Fully amortized intangible assets, Accumulated Amortization	0	0
Accumulated Amortization, Ending Balance	$ 1,512	$ 1,198	$ 1,457
Weighted average remaining contractual life, in years	8 years 150 days