CONSOLIDATED BALANCE SHEETS (UNAUDITED) (Parentheticals) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Statement Of Financial Position [Abstract]
Accounts and other receivables, allowance	$ 406	$ 333
Deferred charges, accumulated amortization	13,002	10,859
Intangible assets, accumulated amortization	103,158	20,509
Intangible liabilities, accumulated amortization	$ 21,064	$ 3,757
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	900,000,000	900,000,000
Common stock, shares issued	212,111,937	212,106,718
Common stock, shares outstanding	212,111,937	212,106,718
Operating partnership, units outstanding	51,660,088	51,543,993