Consolidated Statement of Changes in Stockholders' Equity - 6 months ended Jun. 30, 2015 - USD ($) $ in Thousands	Total	Preferred Stock	Common Stock	Additional Paid-in Capital	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Loss
Balance at beginning of period at Dec. 31, 2014	$ 1,580,070	$ 129,796	$ 1,665	$ 897,049	$ 1,992,833	$ (1,375,322)	$ (65,951)
Increase (Decrease) in Stockholders' Equity
Net income	50,738				50,738
Other comprehensive income, net of tax	144						144
Dividends on preferred stock ($32.50 per share)	(4,388)				(4,388)
Dividends on common stock ($0.08 per share)	(8,024)				(8,024)
Sales of treasury stock (475,182 shares)	6,055				(3,765)	9,820
Restricted stock grants (426,552 shares)				(5,562)	(3,252)	8,814
Forfeitures of restricted stock (50,294 shares)				583	456	(1,039)
Stock-based compensation	3,916			3,903	13
Net tax benefit excess from stock-based compensation	11			11
Balance at end of period at Jun. 30, 2015	$ 1,628,522	$ 129,796	$ 1,665	$ 895,984	$ 2,024,611	$ (1,357,727)	$ (65,807)