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 and comprehensive income	[1]	49,548				49,548
Dividends paid on preferred stocks		(305)				(305)
Stock-based compensation		519			519
Conversion of debentures to common stock		24,408	89		24,319
Conversion of debentures to common stock, shares			888
Exercise of stock options		940	13		927
Exercise of stock options, shares			132
Excess income tax benefit associated with stock-based compensation		1,109			1,109
Ending balance at Jun. 30, 2011		$ 255,589	$ 2,650	$ 3,000	$ 158,719	$ 119,594	$ (28,374)
Ending balance, shares at Jun. 30, 2011			26,497

[1] Note: For the six and three months ended June 30, 2011 and 2010, there were no differences between net income and comprehensive income.