Borrowings (Senior Secured Notes due 2016) (Narrative) (Details)	0 Months Ended
Dec. 09, 2010 Additional Debt [Member] 8.875% Senior Secured Notes due 2016 [Member] EUR (€)	Dec. 02, 2009 9.125% Senior Secured Notes due 2016 [Member] USD ($)	Dec. 02, 2009 8.875% Senior Secured Notes due 2016 [Member] EUR (€)	Jan. 04, 2010 Senior Secured Notes due 2016 [Member] EUR (€)	Jun. 30, 2011 Senior Secured Notes due 2016 [Member] USD ($)	Dec. 31, 2010 Senior Secured Notes due 2016 [Member] USD ($)
Face value of debt issued	€ 50,000,000	$ 380,000,000	€ 380,000,000
Interest rate percentage on issued debt	8.875%	9.125%	8.875%
Year of maturity of debt	2016	2016	2016
Redemption of senior secured notes				245,400,000
Accrued Interest					$ 7,500,000	$ 7,100,000

The cash outflow to repay long-term debt that is wholly or partially secured by collateral. Excludes repayments of tax exempt secured debt.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3291-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 18
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 20
-Subparagraph b
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Financing Activities
-URI http://asc.fasb.org/extlink&oid=6513228

Name:	us-gaap_RepaymentsOfSecuredDebt
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration