Consolidated Statements of Comprehensive Income (Loss) (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Net income	$ 18,239	$ 39,393	$ 58,124	$ 75,944
Other comprehensive income (loss)
Unrealized holding gain (loss) on available-for-sale securities	(1,015)	61	(252)	1,579
Reclassification to net income of realized (gain) loss on available-for-sale securities	0	(160)	0	(160)
Unrealized gain (loss) on hedging instruments	443	(1,332)	163	(1,610)
Reclassification to net income of hedging loss included in net income	562	567	1,119	1,129
Other Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncntrolling and Redeemable Noncontrolling Interest	(10)	(864)	1,030	938
Comprehensive income	18,229	38,529	59,154	76,882
Comprehensive (income) loss attributable to noncontrolling interest in:
Operating partnership	(21)	(5,019)	(3,688)	(9,776)
Other consolidated subsidiaries	6,479	4,805	12,560	10,945
Comprehensive income attributable to the Company	$ 11,729	$ 28,705	$ 42,906	$ 56,161