Unaudited Condensed Consolidated Statement of Equity Statement - USD ($) shares in Thousands, $ 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, 2013	$ 1,424,378	$ 212,327	$ (10)	$ 1,259,348	$ (145,876)	$ 88,441	$ 10,148
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Comprehensive income	80,239	0	0	0	84,675	(10,618)	$ 6,182
Dividends declared on common stock	(53,026)	0	0	(53,026)	0	0
Employee share-based compensation earned	9,742	0	0	9,742	0	0	$ 0
Stock option exercises	28,370	2,855	0	25,515	0	0	0
Restricted stock awards, net of forfeitures	0	352	0	(352)	0	0	0
Purchase of Company common stock	$ (130,923)	$ 0	$ (6,386)	$ (37,653)	$ (86,884)	$ 0	$ 0
Cancellation of Company Stock	0	(42)	(42)	0	0	0	0
Tax Benefits Related to Share-Based Awards	$ 20,727	$ 0	$ 0	$ 20,727	$ 0	$ 0	$ 0
Purchase of noncontrolling interest	(15,000)	0	0	(7,440)	0	0	(7,560)
Noncontrolling interest payment	(135)	0	0	0	0	0	(135)
Other	1,564	93	0	1,471	0	0	0
Balance at end of period at Sep. 30, 2014	1,365,936	215,585	(6,354)	1,218,332	(148,085)	77,823	8,635
Balance at beginning 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	119,543	0	0	0	161,418	(42,913)	1,038
Dividends declared on common stock	(64,068)	0	0	(64,068)	0	0	0
Employee share-based compensation earned	10,717	0	0	10,717	0	0	0
Stock option exercises	30,491	2,951	0	27,540	0	0	0
Restricted stock awards, net of forfeitures	0	259	(3)	(256)	0	0	0
Purchase of Company common stock	(305,488)	$ 0	(11,010)	(63,428)	(231,050)	0	0
Tax Benefits Related to Share-Based Awards	17,266		0	17,266	0	0	0
Purchase of noncontrolling interest	0
Noncontrolling interest payment	(60)	$ 0	0	0	0	0	(60)
Other	1,725	62	0	1,663	0	0	0
Balance at end of period at Sep. 30, 2015	$ 1,187,504	$ 208,730	$ (11,604)	$ 1,115,738	$ (151,491)	$ 16,501	$ 9,630