Consolidated Statements of Changes in Equity (unaudited) (USD $) In Thousands, unless otherwise specified	Total	Common Stock	Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Noncontrolling Interest
Beginning Balance at Dec. 31, 2013	$ 1,025,043	$ 126,193	$ 196,605	$ 691,547	$ 9,568	$ 1,130
Beginning Balance (in shares) at Dec. 31, 2013		63,096
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	25,485			25,485
Other comprehensive income (loss)	565				565
Dividends declared	(15,744)			(15,744)
Shares repurchased and retired (in shares)		(143)
Shares repurchased and retired	(5,000)	(286)		(4,714)
Share-based compensation expense, exercises and other (shares)		138
Share-based compensation expense, exercises and other	2,818	275	2,543
Ending Balance at Mar. 31, 2014	1,033,167	126,182	199,148	696,574	10,133	1,130
Ending Balance (in shares) at Mar. 31, 2014		63,091
Beginning Balance at Dec. 31, 2014	990,838	126,140	202,934	685,765	(24,001)	0
Beginning Balance (in shares) at Dec. 31, 2014	63,070	63,070
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest	18,940			18,940
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other comprehensive income (loss)	(27,645)				(27,645)
Dividends declared	(15,892)			(15,892)
Shares repurchased and retired (in shares)
Shares repurchased and retired	0
Share-based compensation expense, exercises and other (shares)		32
Share-based compensation expense, exercises and other	2,032	65	1,967
Ending Balance at Mar. 31, 2015	$ 968,273	$ 126,205	$ 204,901	$ 688,813	$ (51,646)	$ 0
Ending Balance (in shares) at Mar. 31, 2015	63,102	63,102