Property Transactions Acquisition Pro Forma (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Revenues	$ 210,741	$ 136,846	$ 118,125
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest	112,041	27,605	(131,797)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	126,829	47,919	(123,467)
Net Income (Loss) Available to Common Stockholders, Basic	109,097	32,821	(141,332)
Acquisition Pro Forma [Member]
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Revenues	318,539	301,407
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest	122,901	43,778
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	137,689	64,092
Net Income (Loss) Available to Common Stockholders, Basic	$ 119,957	$ 48,994
Earnings Per Share, Basic	$ 0.63	$ 0.26
Earnings Per Share, Diluted	$ 0.63	$ 0.26