Condensed Consolidated Statement of Stockholders' Equity (Unaudited) (USD $) In Thousands	Total	Common Stock Shares	Non-Redeemable Preferred Stock	Capital in Excess of Par Value	Retained Earnings	Treasury Stock- Common
Beginning balance at Dec. 31, 2010	$ 179,370	$ 2,548	$ 3,000	$ 131,845	$ 70,351	$ (28,374)
Beginning balance, shares at Dec. 31, 2010		25,477
Net income	55,854				55,854
Dividends paid on preferred stocks	(305)				(305)
Stock-based compensation	761			761
Conversion of convertible debt to common stock	26,400	96		26,304
Conversion of convertible debt to common stock, shares		965
Exercise of stock options	974	14		960
Exercise of stock options, shares		143
Excess income tax benefit associated with stock-based compensation	1,100			1,100
Ending balance at Sep. 30, 2011	$ 264,154	$ 2,658	$ 3,000	$ 160,970	$ 125,900	$ (28,374)
Ending balance, shares at Sep. 30, 2011		26,585