Consolidated Statement of Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Treasury Stock	Capital in Excess of Par Value	Accumulated Deficit(1)	Accumulated Other Comprehensive Income	Noncontrolling Interest
Balance at beginning of period at Dec. 31, 2012	$ 1,415,193	$ 211,057	$ (10)	$ 1,307,058	$ (234,429)	$ 111,717	$ 19,800
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Comprehensive income	129,296	0	0	0	147,332	(23,276)	5,240
Dividends declared on common stock	(57,229)	0	0	(57,229)	0	0	0
Stock option exercises	9,313	1,087	0	8,226	0	0	0
Restricted stock awards, net of forfeitures	0	378	(3)	(375)	0	0	0
Employee share-based compensation earned	11,925	0	0	11,925	0	0	0
Purchase of Company common stock	(4,712)	0	(275)	(1,508)	(2,929)	0	0
Tax benefits related to stock-based awards	30,123
Purchase of noncontrolling interest	(23,333)	0	0	(10,023)	0	0	(13,310)
Acquisition	118	0	0	0	0	0	118
Noncontrolling interest payments	$ (1,700)	$ 0	$ 0	$ 0	$ 0	$ 0	$ (1,700)
Retirement of treasury shares	0	(278)	(278)	0	0	0	0
Other	$ 1,357	$ 83	$ 0	$ 1,274	$ 0	$ 0	$ 0
Balance at end of period at Dec. 31, 2013	1,480,228	212,327	(10)	1,259,348	(90,026)	88,441	10,148
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Comprehensive income	149,824	0	0	0	172,469	(29,027)	6,382
Dividends declared on common stock	(71,517)	0	0	(71,517)	0	0	0
Stock option exercises	33,137	3,642	0	29,495	0	0	0
Restricted stock awards, net of forfeitures	0	352	0	(352)	0	0	0
Employee share-based compensation earned	13,127	0	0	13,127	0	0	0
Purchase of Company common stock	(243,635)	0	(11,537)	(67,796)	(164,302)	0	0
Tax benefits related to stock-based awards		0	0	30,123	0	0	0
Purchase of noncontrolling interest	(15,000)	0	0	(7,441)	0	0	(7,559)
Noncontrolling interest payments	$ (319)	$ 0	$ 0	$ 0	$ 0	$ 0	$ (319)
Retirement of treasury shares	0	(10,956)	(10,956)	0	0	0	0
Other	$ 1,410	$ 93	$ 0	$ 1,317	$ 0	$ 0	$ 0
Balance at end of period at Dec. 31, 2014	1,377,378	205,458	(591)	1,186,304	(81,859)	59,414	8,652
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Comprehensive income	181,651	0	0	0	233,772	(53,250)	1,129
Dividends declared on common stock	(87,570)	0	0	(87,570)	0	0	0
Stock option exercises	31,931	3,054	0	28,877	0	0	0
Restricted stock awards, net of forfeitures	0	254	(9)	(245)	0	0	0
Employee share-based compensation earned	13,843	0	0	13,843	0	0	0
Purchase of Company common stock	(345,383)	0	(12,455)	(71,664)	(261,264)	0	0
Tax benefits related to stock-based awards	18,123	0	0	18,123	0	0	0
Purchase of noncontrolling interest	(2,075)	0	0	(2,775)	0	0	(4,850)
Noncontrolling interest payments	$ (222)	$ 0	$ 0	$ 0	$ 0	$ 0	$ (222)
Retirement of treasury shares	0	(7,969)	(7,969)	0	0	0
Other	$ 1,725	$ 62	$ 0	$ 1,663	$ 0	$ 0	$ 0
Balance at end of period at Dec. 31, 2015	$ 1,189,401	$ 200,859	$ (5,086)	$ 1,092,106	$ (109,351)	$ 6,164	$ 4,709