Income Taxes (Summary Of Tax Loss And Tax Credit Carryforwards) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Tax Credit Carryforward [Line Items]
Deferred tax asset on tax carryforwards	$ 77,098	$ 93,337
Valuation Allowance, Amount	(62,064)
Net deferred tax asset on tax carryforwards	15,034
U.S. Federal Tax Credits [Member]
Tax Credit Carryforward [Line Items]
2012-2016	105
After 2016	14,547
Total tax carryforwards	14,652
Deferred tax asset on tax carryforwards	14,652
Valuation Allowance, Amount	(262)
Net deferred tax asset on tax carryforwards	14,390
U.S Federal Tax Losses [Member]
Tax Credit Carryforward [Line Items]
After 2016	1,067
Total tax carryforwards	1,067
Deferred tax asset on tax carryforwards	373
Valuation Allowance, Amount	(373)
Net deferred tax asset on tax carryforwards	0
U.S. State Tax Credits [Member]
Tax Credit Carryforward [Line Items]
2012-2016	2,039
After 2016	4,162
Indefinite	15,959
Total tax carryforwards	22,160
Deferred tax asset on tax carryforwards	14,404
Valuation Allowance, Amount	(13,760)
Net deferred tax asset on tax carryforwards	644
U.S. State Tax Losses [Member]
Tax Credit Carryforward [Line Items]
2012-2016	161,854
After 2016	410,775
Total tax carryforwards	572,629
Deferred tax asset on tax carryforwards	26,297
Valuation Allowance, Amount	(26,297)
Non-U.S. Tax Losses [Member]
Tax Credit Carryforward [Line Items]
2012-2016	6,912
After 2016	30,656
Indefinite	39,088
Total tax carryforwards	76,656
Deferred tax asset on tax carryforwards	21,372
Valuation Allowance, Amount	(21,372)
Net deferred tax asset on tax carryforwards	$ 0