Income Taxes (Statutory Rate and Effective Tax Rate) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Tax Disclosure [Abstract]
Income taxes at The Netherlands statutory rate amounts	$ 36,288	$ 24,053	$ 44,146
Income taxes at The Netherlands statutory rate, rate	25.00%	25.00%	25.50%
Earnings of subsidiaries taxed at different rates, amounts	5,180	3,204	7,710
Earnings of subsidiaries taxed at different rates, rate	3.60%	3.30%	4.50%
Tax impact from permanent items, amounts	4,854	5,989	3,295
Tax impact from permanent items, rate	3.40%	6.20%	1.90%
Tax impact from tax exempt income, amounts	(36,969)	(23,382)	(10,283)
Tax impact from tax exempt income, rate	(25.50%)	(24.30%)	(6.00%)
Tax contingencies, net, amounts	2,729	(1,675)	(1,269)
Tax contingencies, net, rate	1.90%	(1.70%)	(0.70%)
Taxes due to changes in tax rates, amounts	(1,086)	(3,521)	(1,400)
Taxes due to changes in tax rates, rate	(0.80%)	(3.70%)	(0.80%)
Taxes due to changes in tax laws	2,697	0	0
Taxes due to changes in tax laws, rate	1.90%	0.00%	0.00%
Restructuring, amount	0	0	(12,903)
Restructuring, rate	0.00%	0.00%	(7.50%)
Income Tax Reconciliation, Prior Year Income Taxes	2,805	(2,632)	476
Effective Income Tax Rate Reconciliation, Prior Year Income Taxes	1.90%	(2.70%)	0.30%
Other items, net, amounts	(882)	(773)	(962)
Other items, net, rate	(0.60%)	(0.80%)	(0.60%)
Total provision for income taxes	$ 15,616	$ 1,263	$ 28,810
Total provision for income taxes, rate	10.80%	1.30%	16.60%

Effective Income Tax Rate Reconciliation Change In Enacted Tax Laws

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Effective Income Tax Rate Reconciliation Tax Impact From Permanent Items

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A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

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The domestic federal statutory tax rate applicable under enacted tax laws to the Company's pretax income from continuing operations for the period. The "statutory" tax rate is the regular tax rate if there are alternative tax systems.

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The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate that can be explained by the difference between statutory income tax rates in foreign jurisdictions and the domestic federal statutory income tax rate recorded during the period.

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The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate attributable to revisions in previously reported amounts of income tax provision.

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The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate attributable to income that is exempt from income taxes under enacted tax laws.

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