Related Person Transactions Related Person (Narrative) (Details) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended									3 Months Ended	6 Months Ended		3 Months Ended		6 Months Ended
	Jun. 30, 2012 USD ($)	Jun. 30, 2011 USD ($)	Jun. 30, 2012 USD ($) D	Jun. 30, 2011 USD ($)	Sep. 30, 2011 USD ($)	Jun. 30, 2012 Long-term Debt [Member] USD ($)	Jun. 30, 2012 Long-term Debt [Member] EUR (€)	Jun. 30, 2012 Line of Credit [Member] USD ($)	Jun. 30, 2012 Line of Credit [Member] EUR (€)	Sep. 30, 2011 Line of Credit [Member] USD ($)	Sep. 30, 2011 Line of Credit [Member] EUR (€)	Jun. 30, 2012 Parent Company [Member] USD ($)	Jun. 30, 2012 Parent Company [Member] USD ($)	Dec. 31, 2011 Parent Company [Member] USD ($)	Jun. 30, 2012 Corporate Joint Venture [Member] USD ($)	Jun. 30, 2011 Corporate Joint Venture [Member] USD ($)	Jun. 30, 2012 Corporate Joint Venture [Member] USD ($)	Jun. 30, 2011 Corporate Joint Venture [Member] USD ($)	Dec. 31, 2011 Corporate Joint Venture [Member] USD ($)
Related Party Transaction [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 300,000		$ 300,000
Related Party Transaction, Rate			0.25%
Long-term Debt	200,000		200,000			140,000	45,000
Interest Expense, Related Party	4,498	5,768	9,106	11,554
Revolving Credit Facility, Maximum Borrowing Capacity		150,000		150,000	100,000			125,000	20,000	75,000	20,000
Loss on early retirement of debt	0	899	0	899
Loans and Leases Receivable, Related Parties												271,003	271,003	168,450	15,011		15,011		10,277
Weighted Average Interest Rate of Time Deposits, $100,000 or More, Three Months or Less	0.60%		0.60%
Maturity Date Range Start, Investment			6
Maturity Date Range End, Investment			28
Interest and Other Income												$ 371	$ 722		$ 16	$ 8	$ 27	$ 10