Combined Consolidated Statements of Changes in Equity (Unaudited) - USD ($) $ in Thousands	Total	Additional Paid-in-Capital	Treasury Stock	Retained Earnings/(Dividends in Excess of Earnings)	Accumulated Other Comprehensive Income (Loss)	Noncontrolling Interests Operating Partnership	Noncontrolling Interests Consolidated Joint Ventures	Class A Common Stock Common Stock	Class B Common Stock Common Stock
Beginning Balance at Dec. 31, 2014	$ 1,505,207	$ 725,538	$ 0	$ 44,187	$ 15,656	$ 711,674	$ 8,101	$ 51	$ 0
Beginning Balance (in shares) at Dec. 31, 2014								51,432,000	47,647,000
Increase Decrease in Stockholders' Equity
Contributions	74						74
Distributions	(72,603)					(68,673)	(3,930)
Amendment of the par value of the Class B shares from no par value per share to $0.001 per share	0					(47)			$ 47
Equity based compensation	13,788	417				13,371
Grants of restricted stock	0	(1)						$ 1
Grants of restricted stock (in shares)								700,000
Purchase of treasury stock	(994)		(994)
Purchase of treasury stock (in shares)								(84,000)
Re-issuance of treasury stock	0
Re-issuance of treasury stock (in shares)								26,000
Shares acquired to satisfy minimum required federal and state tax withholding on vesting restricted stock and units	(4,897)		(4,818)			(79)
Shares acquired to satisfy minimum required federal and state tax withholding on vesting restricted stock and units (in shares)								(262,000)	(5,000)
Forfeitures	0
Forfeitures (in shares)								(188,000)
Dividends declared	(57,390)			(57,390)
Exchange of noncontrolling interest for common stock	0	53,011			645	(53,656)		$ 3	$ (3)
Exchange of noncontrolling interest for common stock (in shares)								3,586,000	(3,586,000)
Adjustment to the Tax Receivable Agreement as a result of the exchange of Class B shares	(1,366)	(1,366)
Net income (loss)	146,134			73,821		70,745	1,568
Other comprehensive income	(36,545)				(20,046)	(16,499)
Rebalancing of ownership percentage between Company and Operating Partnership	0	(733)			189	544
Ending Balance at Dec. 31, 2015	1,491,408	776,866	(5,812)	60,618	(3,556)	657,380	5,813	$ 55	$ 44
Ending Balance (in shares) at Dec. 31, 2015								55,210,000	44,056,000
Increase Decrease in Stockholders' Equity
Contributions	250					250	0
Distributions	(26,933)					(26,704)	(229)
Equity based compensation	8,118	250				7,868
Grants of restricted stock	0	(1)						$ 1
Grants of restricted stock (in shares)								794,000
Purchase of treasury stock	(4,652)		(4,652)
Purchase of treasury stock (in shares)								(424,000)
Shares acquired to satisfy minimum required federal and state tax withholding on vesting restricted stock and units	(786)		(780)			(6)
Shares acquired to satisfy minimum required federal and state tax withholding on vesting restricted stock and units (in shares)								(73,000)	(1,000)
Forfeitures	0
Forfeitures (in shares)								(48,000)
Dividends declared	(34,885)			(34,885)
Stock dividends	0	64,090		(64,100)				$ 6	$ 4
Stock dividends (in shares)								5,606,000	4,469,000
Exchange of noncontrolling interest for common stock	(772)	27,675			(122)	(28,325)		$ 2	$ (2)
Exchange of noncontrolling interest for common stock (in shares)								2,077,764	(2,077,764)
Net income (loss)	(7,500)			(2,737)		(4,765)	2
Other comprehensive income	61,851				35,295	26,556
Rebalancing of ownership percentage between Company and Operating Partnership	0	2,507			339	(2,846)
Ending Balance at Jun. 30, 2016	$ 1,486,099	$ 871,387	$ (11,244)	$ (41,104)	$ 31,956	$ 629,408	$ 5,586	$ 64	$ 46
Ending Balance (in shares) at Jun. 30, 2016								63,143,000	46,446,000