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	Redeemable Noncontrolling Interests
Balance (in shares) at Dec. 31, 2015		211,340,296
Balance at Dec. 31, 2015	$ 528,607	$ 2,113	$ 1,623,863	$ (942,218)	$ (174,917)	$ 19,766
Increase (Decrease) in Stockholders' Equity
Issuance of shares under employee stock purchase plan and option plans and stock-based compensation (in shares)		552,458
Issuance of shares under employee stock purchase plan and option plans and stock-based compensation	5,114	$ 6	5,108
Parent cash dividends declared	(103,088)			(103,088)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Excluding Redeemable Noncontrolling Interest, Net of Tax	23,978				23,491	487
Market Value Adjustments for Securities	(734)				(734)
Net income (loss)	63,041			62,774		267
Noncontrolling interests equity contributions	1,299					1,299
Noncontrolling interests dividends	(579)					(579)
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests	3,506					3,506
Balance at Mar. 31, 2016	521,144	$ 2,119	1,628,971	(982,532)	(152,160)	24,746
Balance (in shares) at Mar. 31, 2016		211,892,754
Increase (Decrease) in Stockholders' Equity
Redeemable Noncontrolling Interest	$ 54,697						$ 54,697
Balance (in shares) at Dec. 31, 2016	263,682,670	263,682,670
Balance at Dec. 31, 2016	$ 1,936,671	$ 2,636	3,489,795	(1,343,311)	(212,573)	124
Increase (Decrease) in Stockholders' Equity
Issuance of shares under employee stock purchase plan and option plans and stock-based compensation (in shares)		427,718
Issuance of shares under employee stock purchase plan and option plans and stock-based compensation	2,453	$ 5	2,448
Adjustments to Additional Paid in Capital, Change in Value of Redeemable Noncontrolling Interests	(307)		(307)
Temporary Equity, Accretion to Redemption Value							307
Parent cash dividends declared	(145,427)			(145,427)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Excluding Redeemable Noncontrolling Interest, Net of Tax	51,405				51,334	71
Temporary Equity, Foreign Currency Translation Adjustments							(621)
Market Value Adjustments for Securities	0
Net income (loss)	58,507
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest	58,350			58,125		225
Temporary Equity, Net Income							157
Noncontrolling interests equity contributions	0					0
Noncontrolling interest equity contributions, redeemable noncontrolling interests							13,230
Noncontrolling interests dividends	(214)					(214)
Temporary Equity, Accretion of Dividends							(462)
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests	843					843
Balance at Mar. 31, 2017	$ 1,903,774	$ 2,641	$ 3,491,936	$ (1,430,613)	$ (161,239)	$ 1,049
Balance (in shares) at Mar. 31, 2017	264,110,388	264,110,388
Increase (Decrease) in Stockholders' Equity
Redeemable Noncontrolling Interest	$ 67,308						$ 67,308