CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (USD $) In Thousands, except Share data, unless otherwise specified		Preferred stock	Common stock	Additional paid-in capital	Accumulated other comprehensive income (loss)	Retained earnings	Treasury shares	Total
Balance at Dec. 31, 2013 (As Reported)		$ 267,616	$ 54,667	$ 541,210	$ (15,641)	$ 1,918,163	$ (25,029)	$ 2,740,986
Balance at Dec. 31, 2013		267,616	54,667	541,210	(15,641)	1,906,222	(25,029)	2,729,045
Balance (in shares) at Dec. 31, 2013 (As Reported)			54,667,295
Balance (in shares) at Dec. 31, 2013			54,667,295
Increase (Decrease) in Stockholders' Equity
Net income	[1]					53,830		53,830
Other comprehensive income (loss), net of tax					11,278			11,278
Issuance of shares under share-based compensation plans			232	6,702			2,492	9,426
Issuance of shares under share-based compensation plans (in shares)			231,763
Share-based employee compensation expense				4,459				4,459
Tax benefit from share-based compensation plans				2,866				2,866
Dividends : Preferred						(4,094)		(4,094)
Dividends: Common						(18,224)		(18,224)
Net change in deferred compensation plans				181				181
Change in redeemable noncontrolling interest				(5,429)				(5,429)
Balance at Mar. 31, 2014		267,616	54,899	549,989	(4,363)	1,937,734	(22,537)	2,783,338
Balance (in shares) at Mar. 31, 2014			54,899,058
Balance at Dec. 31, 2012
Increase (Decrease) in Stockholders' Equity
Adjustment of initially apply Accounting Standards Update 2014-01						(11,941)		(11,941)
Balance at Dec. 31, 2013 (As Reported)		267,616	54,667	541,210	(15,641)	1,918,163	(25,029)	2,740,986
Balance at Dec. 31, 2013		267,616				1,906,222		2,729,045
Balance (in shares) at Dec. 31, 2013 (As Reported)			54,667,295
Balance at Dec. 31, 2014		267,616	55,162	578,046	(7,074)	2,071,230	(22,279)	2,942,701
Balance (in shares) at Dec. 31, 2014			55,162,455
Increase (Decrease) in Stockholders' Equity
Net income	[1]					61,566		61,566
Other comprehensive income (loss), net of tax					12,105			12,105
Issuance of shares under share-based compensation plans			348	14,459			3,536	18,343
Issuance of shares under share-based compensation plans (in shares)			347,596
Share-based employee compensation expense				4,252				4,252
Tax benefit from share-based compensation plans				3,211				3,211
Dividends : Preferred						(4,094)		(4,094)
Dividends: Common						(19,545)		(19,545)
Net change in deferred compensation plans				105			(1)	104
Net change in deferred compensation plans (in shares)			270
Change in redeemable noncontrolling interest				(273)				(273)
Balance at Mar. 31, 2015		$ 267,616	$ 55,510	$ 599,800	$ 5,031	$ 2,109,157	$ (18,744)	$ 3,018,370
Balance (in shares) at Mar. 31, 2015			55,510,321

[1] Net income excludes net income attributable to redeemable noncontrolling interest of $553 and $699 for the three month periods ended March 31, 2015 and 2014, respectively. Redeemable noncontrolling interest is reflected in the mezzanine section of the consolidated balance sheets. See Note 17 of the Notes to the Unaudited Consolidated Financial Statements.