CONSOLIDATED STATEMENT OF CHANGES IN EQUITY - 6 months ended Jun. 30, 2016 - USD ($) $ in Thousands	Total	Common Stock	Limited Voting Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Loss	Accumulated Deficit	Noncontrolling Interests
Beginning balance at Dec. 31, 2015	$ 1,636,211	$ 112	$ 4	$ 1,854,913	$ (6,199)	$ (460,131)	$ 247,512
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	63,469					59,234	4,235
Other comprehensive loss	(5,264)				(5,120)		(144)
Common dividends declared – $0.375 per share	(43,810)					(41,986)	(1,824)
Share-based compensation	2,792			2,792
Issuance of 16,325 shares to directors	275			275
Issuance of common stock upon redemption of Operating Partnership units	0	0		91			(91)
Distributions to noncontrolling interests	(52)						(52)
Ending balance at Jun. 30, 2016	$ 1,653,621	$ 112	$ 4	$ 1,858,071	$ (11,319)	$ (442,883)	$ 249,636