CONSOLIDATED STATEMENTS OF EQUITY - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Earnings in Excess of Distributions (Distributions in Excess of Earnings)	Accumulated Other Comprehensive Items, Net	Noncontrolling Interests
Balance at Dec. 31, 2012	$ 1,157,148	$ 1,900	$ 942,199	$ 180,258	$ 20,314	$ 12,477
Balance (in shares) at Dec. 31, 2012		190,005,788
Increase (Decrease) in Stockholders' Equity
Issuance of shares under employee stock purchase plan and option plans and stock-based compensation, including tax benefit (deficiency)	50,479	$ 14	50,465
Issuance of shares under employee stock purchase plan and option plans and stock-based compensation, including tax benefit (deficiency) (in shares)		1,421,132
Parent cash dividends declared	(208,900)			(208,900)
Currency translation adjustment	(31,532)				(29,900)	(1,632)
Market value adjustments for securities	926				926
Net income (loss)	99,992			96,462		3,530
Noncontrolling interests equity contributions	743					743
Noncontrolling interests dividends	(2,270)					(2,270)
Purchase of noncontrolling interests	(14,852)		(12,500)			(2,352)
Balance at Dec. 31, 2013	1,051,734	$ 1,914	980,164	67,820	(8,660)	10,496
Balance (in shares) at Dec. 31, 2013		191,426,920
Increase (Decrease) in Stockholders' Equity
Issuance of shares under employee stock purchase plan and option plans and stock-based compensation, including tax benefit (deficiency)	64,473	$ 26	64,447
Issuance of shares under employee stock purchase plan and option plans and stock-based compensation, including tax benefit (deficiency) (in shares)		2,638,554
Parent cash dividends declared	(493,513)			(493,513)
Special distribution in connection with conversion to REIT (in shares)		15,753,338
Special distribution in connection with conversion to REIT		$ 158	559,821	(559,979)
Currency translation adjustment	(66,867)				(66,424)	(443)
Market value adjustments for securities	53				53
Net income (loss)	328,746			326,119		2,627
Noncontrolling interests equity contributions	1,800					1,800
Noncontrolling interests dividends	(1,613)					(1,613)
Purchase of noncontrolling interests	(20,416)		(17,693)			(2,723)
Divestiture of noncontrolling interests	5,558		2,102			3,456
Balance at Dec. 31, 2014	$ 869,955	$ 2,098	1,588,841	(659,553)	(75,031)	13,600
Balance (in shares) at Dec. 31, 2014	209,818,812	209,818,812
Increase (Decrease) in Stockholders' Equity
Issuance of shares under employee stock purchase plan and option plans and stock-based compensation, including tax benefit (deficiency)	$ 35,037	$ 15	35,022
Issuance of shares under employee stock purchase plan and option plans and stock-based compensation, including tax benefit (deficiency) (in shares)		1,521,484
Parent cash dividends declared	(405,906)			(405,906)
Currency translation adjustment	(100,970)				(99,641)	(1,329)
Market value adjustments for securities	(245)				(245)
Net income (loss)	125,203			123,241		1,962
Noncontrolling interests equity contributions	7,590					7,590
Noncontrolling interests dividends	(2,057)					(2,057)
Balance at Dec. 31, 2015	$ 528,607	$ 2,113	$ 1,623,863	$ (942,218)	$ (174,917)	$ 19,766
Balance (in shares) at Dec. 31, 2015	211,340,296	211,340,296