CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (USD $) In Thousands, except Share data, unless otherwise specified	Total	Common stock	Treasury stock	Additional Paid-in capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Non-controlling interest
BALANCE at Dec. 31, 2010	$ 794,641	$ 1,569		$ 457,521	$ 397,997	$ (64,063)	$ 1,617
BALANCE (in shares) at Dec. 31, 2010		156,955,746
Increase (Decrease) in Stockholders' Equity
Stock-based compensation from option awards	17,193			17,193
Stock options exercised	5,352	4		5,348
Stock options exercised (in shares)	364,324	364,324
Foreign currency translation adjustment	(47,698)					(47,691)	(7)
Acquisition of non-controlling interest	2,206			1,907			299
Net income	60,516				53,117		7,399
Dividends declared	(135,002)				(128,930)		(6,072)
BALANCE at Dec. 31, 2011	697,208	1,573		481,969	322,184	(111,754)	3,236
BALANCE (in shares) at Dec. 31, 2011		157,320,070
Increase (Decrease) in Stockholders' Equity
Stock-based compensation from option awards	5,349			5,349
Stock options exercised	4,616	9		4,607
Stock options exercised (in shares)	840,649	840,649
Foreign currency translation adjustment	43,616					43,567	49
Net income	99,816				93,063		6,753
Dividends declared	(87,679)				(82,244)		(5,435)
BALANCE at Dec. 31, 2012	762,926	1,582		491,925	333,003	(68,187)	4,603
BALANCE (in shares) at Dec. 31, 2012		158,160,719
Increase (Decrease) in Stockholders' Equity
Stock-based compensation from option awards	1,743			1,743
Stock options exercised	454	0		454
Stock options exercised (in shares)	50,000	50,000
Repurchase of common stock	(29,727)		(29,727)
Repurchase of common stock (in shares)	2,500,000		(2,500,000)
Foreign currency translation adjustment	(56,258)					(56,152)	(106)
Net income	160,161				152,340		7,821
Dividends declared	(105,183)				(98,768)		(6,415)
BALANCE at Dec. 31, 2013	$ 734,116	$ 1,582	$ (29,727)	$ 494,122	$ 386,575	$ (124,339)	$ 5,903
BALANCE (in shares) at Dec. 31, 2013		158,210,719	(2,500,000)