Accumulated Other Comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013
Accumulated other comprehensive (loss) income, Beginning Balance	$ (18,946)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	139,899
Accumulated other comprehensive (loss) income, Ending Balance	120,953
Unrealized gain (loss) on securities available for sale [Member]
Accumulated other comprehensive (loss) income, Beginning Balance	19,432
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	148,789
Accumulated other comprehensive (loss) income, Ending Balance	168,221
Pro-rata share of non consolidated subsidiaries' OCI [Member]
Accumulated other comprehensive (loss) income, Beginning Balance	11,313
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(3,647)
Accumulated other comprehensive (loss) income, Ending Balance	7,666
Change in value of interest rate Swap [Member]
Accumulated other comprehensive (loss) income, Beginning Balance	(50,065)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	2,523
Accumulated other comprehensive (loss) income, Ending Balance	(47,542)
Other [Member]
Accumulated other comprehensive (loss) income, Beginning Balance	374
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(7,766)
Accumulated other comprehensive (loss) income, Ending Balance	$ (7,392)