Consolidated Statements of Changes in Equity (USD $) In Thousands, unless otherwise specified	Total	Common Stock	Contingent Convertible Preferred Stock	Restricted stock units	Additional paid-in capital	Exchangeable shares of subsidiary	Retained earnings	Accumulated other comprehensive income	Treasury Stock	Parent	Noncontrolling interests
Beginning Balance at Dec. 31, 2011		$ 358	$ 46,950	$ 99,916	$ 412,283	$ 6,578	$ 173,374	$ 3,128	$ (396,386)		$ 1,353
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued		7	0		51,306
Restricted stock units recognized				54,178
Restricted stock units delivered				(46,841)
Tax benefit (expense)					(4,947)		1,581
Exchangeable shares of subsidiary delivered						(4,620)
Dividends							(57,129)
Net income allocated to common stockholders	42,092						42,092
Currency translation adjustment, net of tax	3,496							3,496
Repurchased									(83,165)
Distributions to noncontrolling interests											0
Ending Balance at Dec. 31, 2012	303,512	365	46,950	107,253	458,642	1,958	159,918	6,624	(479,551)	302,159	1,353
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued		14	(32,504)		77,920
Restricted stock units recognized				56,100
Restricted stock units delivered				(46,095)
Tax benefit (expense)					(2,029)		2,037
Exchangeable shares of subsidiary delivered						0
Dividends							(56,225)
Net income allocated to common stockholders	46,682						46,682
Currency translation adjustment, net of tax	(15,985)							(15,985)
Repurchased									(55,406)
Distributions to noncontrolling interests											(311)
Ending Balance at Dec. 31, 2013	277,710	379	14,446	117,258	534,533	1,958	152,412	(9,361)	(534,957)	276,668	1,042
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued		10	0		66,591
Restricted stock units recognized				39,990
Restricted stock units delivered				(67,141)
Tax benefit (expense)					(4,661)		1,773
Exchangeable shares of subsidiary delivered						0
Dividends							(56,283)
Net income allocated to common stockholders	43,388						43,388
Currency translation adjustment, net of tax	(8,608)							(8,608)
Repurchased									(36,179)
Distributions to noncontrolling interests											(348)
Ending Balance at Dec. 31, 2014	$ 256,242	$ 389	$ 14,446	$ 90,107	$ 596,463	$ 1,958	$ 141,290	$ (17,969)	$ (571,136)	$ 255,548	$ 694