Derivative Financial Instruments (Details 2) (Cash flow hedges, USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Amount of gain (loss) recognized
Deferred net gain on cash flow hedges reclassified from accumulated other comprehensive income to earnings	$ 200,000
Other Revenues
Amount of gain (loss) recognized
From AOCI(L) to Earnings		19,850,000
Cross currency interest rate
Amount of gain (loss) recognized
AOCI(L)		15,750,000
From AOCI(L) to Earnings	160,000	20,005,000
Recognized in Other Revenues		52,000
Cross currency interest rate | Other Revenues
Amount of gain (loss) recognized
From AOCI(L) to Earnings		19,850,000
Cross currency interest rate | Interest Expense
Amount of gain (loss) recognized
From AOCI(L) to Earnings	$ 160,000	$ 155,000