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 (Loss)	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]
Stock issued		7	0		51,306
Restricted stock units recognized				54,178
Restricted stock units delivered				(46,841)
Tax benefit from the delivery of restricted stock units					(4,947)
Exchangeable shares of subsidiary delivered						(4,620)
Dividends							(57,129)
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense							1,581
Net income allocated to common stockholders	16,136						42,092
Currency translation adjustment, net of tax	2,750							3,496
Repurchased									(83,165)
Net income (loss) allocated to noncontrolling interests	0										0
Distributions to noncontrolling interests											0
Ending Balance at Mar. 31, 2012	303,512	365	46,950	107,253	458,642	1,958	159,918	6,624	(479,551)	302,159	1,353
Beginning Balance at Dec. 31, 2012	303,512	365	46,950	107,253	458,642	1,958	159,918	6,624	(479,551)		1,353
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock issued		5	0		30,712
Restricted stock units recognized				15,071
Restricted stock units delivered				(30,562)
Tax benefit from the delivery of restricted stock units					(800)
Exchangeable shares of subsidiary delivered						0
Dividends							(14,082)
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense							596
Net income allocated to common stockholders	13,618						13,618
Currency translation adjustment, net of tax	(1,459)							(1,459)
Repurchased									(20,486)
Net income (loss) allocated to noncontrolling interests	0										0
Distributions to noncontrolling interests											(162)
Ending Balance at Mar. 31, 2013	$ 295,963	$ 370	$ 46,950	$ 91,762	$ 488,554	$ 1,958	$ 160,050	$ 5,165	$ (500,037)	$ 294,772	$ 1,191