Consolidated Statements Of Changes In Equity (USD $) In Thousands, unless otherwise specified		Total	Preferred Stock [Member]	Common Stock [Member]	Treasury Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Noncontrolling Interest [Member]
Beginning Balance at Dec. 31, 2010		$ 1,227,910	$ 238,903	$ 70,972	$ (20,054)	$ 954,977	$ (36,999)	$ 20,078	$ 33
Comprehensive Income:
Net income		19,992					19,862		130
Other comprehensive income	[1]	12,457						12,457
Total comprehensive income		32,449
Cash dividends declared:
Common stock ($0.02 per share)		(1,417)					(1,417)
Preferred stock		(6,095)					(6,095)
Issuance of common stock		(9)				(9)
Accretion of preferred stock discount			739				(739)
Common stock issued under benefit plans		1,012		166		846
Shortfall tax benefit from share-based compensation		(405)				(405)
Stock repurchased in connection with benefit plans		(561)			(561)
Share-based compensation expense		7,764		17		7,747
Ending Balance at Jun. 30, 2011		1,260,648	239,642	71,155	(20,615)	963,156	(25,388)	32,535	163
Beginning Balance at Dec. 31, 2011		1,296,752	240,403	71,483	(21,454)	968,787	(9,164)	46,697
Comprehensive Income:
Net income		31,759					31,759
Other comprehensive income	[1]	4,290						4,290
Total comprehensive income		36,049
Cash dividends declared:
Common stock ($0.02 per share)		(1,449)					(1,449)
Preferred stock		(6,096)					(6,096)
Accretion of preferred stock discount			782				(782)
Common stock issued under benefit plans		274		339		(65)
Stock repurchased in connection with benefit plans		(1,185)			(1,185)
Share-based compensation expense		9,809		21		9,788
Ending Balance at Jun. 30, 2012		$ 1,334,154	$ 241,185	$ 71,843	$ (22,639)	$ 978,510	$ 14,268	$ 50,987

[1] Net of taxes and reclassification adjustments.