CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($) $ in Thousands		Preferred stock	Common stock	Additional paid-in capital	Accumulated other comprehensive (loss) income	Retained earnings	Treasury shares	Total
Balance (As Reported) at Dec. 31, 2013		$ 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) (As Reported) at Dec. 31, 2013			54,667,295
Balance (in shares) at Dec. 31, 2013			54,667,295
Increase (Decrease) in Stockholders' Equity
Net income	[1]					189,182		189,182
Other comprehensive income (loss), net of tax					8,049			8,049
Issuance of shares under share-based compensation plans			$ 391	14,402			2,688	17,481
Issuance of shares under share-based compensation plans (in shares)			390,442
Share-based employee compensation expense				13,305				13,305
Tax benefit from share-based compensation plans				4,188				4,188
Dividends : Preferred						(12,281)		(12,281)
Dividends: Common						(54,877)		(54,877)
Net change in deferred compensation plans				884			(2)	882
Change in redeemable noncontrolling interest				(8,167)				(8,167)
Balance at Sep. 30, 2014		267,616	$ 55,058	565,822	(7,592)	2,028,246	(22,343)	2,886,807
Balance (in shares) at Sep. 30, 2014			55,057,737
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]					201,873		201,873
Other comprehensive income (loss), net of tax					9,574			9,574
Issuance of shares under share-based compensation plans			$ 533	22,958			3,814	27,305
Issuance of shares under share-based compensation plans (in shares)			532,616
Share-based employee compensation expense				12,241				12,241
Tax benefit from share-based compensation plans				8,012				8,012
Dividends : Preferred						(12,281)		(12,281)
Dividends: Common						(78,563)		(78,563)
Net change in deferred compensation plans			$ 1	847			(1)	847
Net change in deferred compensation plans (in shares)			691
Change in redeemable noncontrolling interest				(388)				(388)
Balance at Sep. 30, 2015		$ 267,616	$ 55,696	$ 621,716	$ 2,500	$ 2,182,259	$ (18,466)	$ 3,111,321
Balance (in shares) at Sep. 30, 2015			55,695,762

[1] Net income excludes net income attributable to redeemable noncontrolling interest of $954 and $2,056 for the nine-month periods ended September 30, 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.