Consolidated Statements of Changes in Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Noncontrolling Interest
Beginning Balance (in shares) at Dec. 31, 2013		63,096
Beginning Balance at Dec. 31, 2013	$ 1,025,043	$ 126,193	$ 196,605	$ 691,547	$ 9,568	$ 1,130
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	52,516			52,516
Other comprehensive loss	(16,675)				(16,675)
Dividends declared	(47,201)			(47,201)
Shares repurchased and retired (in shares)		(291)
Shares repurchased and retired	(9,934)	$ (583)		(9,351)
Share-based compensation expense, exercises and other (shares)		275
Share-based compensation expense, exercises and other	5,600	$ 549	5,051
Purchase of noncontrolling interest	(1,825)		(695)			(1,130)
Ending Balance (in shares) at Sep. 30, 2014		63,080
Ending Balance at Sep. 30, 2014	$ 1,007,524	$ 126,159	200,961	687,511	(7,107)	0
Beginning Balance (in shares) at Dec. 31, 2014	63,070	63,070
Beginning Balance at Dec. 31, 2014	$ 990,838	$ 126,140	202,934	685,765	(24,001)	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	71,342			71,342
Other comprehensive loss	(18,554)				(18,554)
Dividends declared	$ (47,648)			(47,648)
Shares repurchased and retired (in shares)	(500)	(469)
Shares repurchased and retired	$ (15,820)	$ (938)		(14,882)
Share-based compensation expense, exercises and other (shares)		331
Share-based compensation expense, exercises and other	$ 5,943	$ 661	5,282
Ending Balance (in shares) at Sep. 30, 2015	62,932	62,932
Ending Balance at Sep. 30, 2015	$ 986,101	$ 125,863	$ 208,216	$ 694,577	$ (42,555)	$ 0