Income Taxes (Details 3) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	35.00%	35.00%	35.00%
Income tax expense/(benefit)
U.S. federal income tax expense/(benefit)	$ 28,819,000	$ (8,493,000)	$ 21,853,000
State income tax provision	2,678,000	46,000	2,497,000
Other items	(137,000)	246,000	(1,682,000)
Income Tax (benefit)/expense, Conversion of certain TRS entities to REITs	(5,770,000)	0	0
Valuation allowance	404,000	(80,000)	(43,744,000)
Total income tax expense/(benefit)	25,994,000	(8,281,000)	(21,076,000)
Unrecognized Tax Benefits	$ 0	$ 0