Unaudited Condensed Consolidated Statement of Equity Statement - 9 months ended Sep. 30, 2016 - USD ($) $ in Thousands	Total	Common Stock	Treasury Stock	Capital in Excess of Par Value	Accumulated Deficit	Accumulated Other Comprehensive Income (Loss)	Noncontrolling Interest
Balance at beginning of period at Dec. 31, 2015	$ 1,189,401	$ 200,859	$ (5,086)	$ 1,092,106	$ (109,351)	$ 6,164	$ 4,709
Stockholders' Equity [Roll Forward]
Comprehensive income	129,004	0	0	0	110,792	18,110	102
Dividends declared on common stock	(73,665)	0	0	(73,665)	0	0	0
Employee share-based compensation earned	10,199	0	0	10,199	0	0	0
Stock option exercises	16,029	1,924	0	14,105	0	0	0
Restricted stock awards, net of forfeitures	0	242	(1)	(241)	0	0	0
Purchase of Company common stock	(192,991)	0	(7,544)	(41,264)	(144,183)	0	0
Tax Benefits Related to Share-Based Awards	(11,512)	0	0	(11,512)	0	0	0
Noncontrolling interest purchases	(1,961)	0	0	(364)		0	(2,325)
Other	2,170	95	0	2,155	0	0	(80)
Balance at end of period at Sep. 30, 2016	$ 1,089,698	$ 203,120	$ (12,631)	$ 1,015,271	$ (142,742)	$ 24,274	$ 2,406