Condensed Consolidated Statements of Equity (USD $)	Total	Alaska Joint Venture Acquisition [Member]	RJ LLC [Member]	2,770 Property Contribution [Member]	Class A Common Shares [Member]	Class A Common Shares [Member] Alaska Joint Venture Acquisition [Member]	Class A Common Shares [Member] Subscription Agreement [Member]	Class B Common Shares [Member]	Class B Common Shares [Member] 2,770 Property Contribution [Member]	Additional Paid-in Capital [Member]	Additional Paid-in Capital [Member] Alaska Joint Venture Acquisition [Member]	Additional Paid-in Capital [Member] 2,770 Property Contribution [Member]	Additional Paid-in Capital [Member] Subscription Agreement [Member]	Accumulated Deficit [Member]	Shareholders' Equity [Member]	Shareholders' Equity [Member] Alaska Joint Venture Acquisition [Member]	Shareholders' Equity [Member] 2,770 Property Contribution [Member]	Noncontrolling Interest [Member]	Noncontrolling Interest [Member] Alaska Joint Venture Acquisition [Member]	Noncontrolling Interest [Member] RJ LLC [Member]	Noncontrolling Interest [Member] 2,770 Property Contribution [Member]
Beginning Balances at Dec. 31, 2012	$ 905,164,000				$ 387,000					$ 914,565,000				$ (10,278,000)	$ 904,674,000			$ 490,000
Beginning Balances, shares at Dec. 31, 2012					38,663,998			667
Issuance of Class A common shares, net of offering costs of $44,003	703,497,000				467,000					703,030,000					703,497,000
Issuance of common stock, shares					46,718,750
Issuance of common stock other				33,535,000			4,000		6,000			(356,487,000)	(4,000)				(356,481,000)				390,016,000
Issuance of common stock other, shares							434,783		634,408
Management Internalization	65,188,000																	65,188,000
Joint Venture Acquisition		904,487,000	61,060,000			436,000					703,856,000					704,292,000			200,195,000	61,060,000
Joint Venture Acquisition, shares						43,609,394
Share-based compensation	453,000									453,000					453,000
Share-based compensation, Shares					6,500
Distributions to noncontrolling interests	(5,858,000)																	(5,858,000)
Conversion of preferred units	(10,456,000)													(10,456,000)	(10,456,000)
Net loss	(5,734,000)													(11,293,000)	(11,293,000)			5,559,000
Ending Balances at Jun. 30, 2013	$ 2,651,336,000				$ 1,294,000			$ 6,000		$ 1,965,413,000				$ (32,027,000)	$ 1,934,686,000			$ 716,650,000
Ending Balances, shares at Jun. 30, 2013					129,433,425			635,075