Stockholders' Equity (Narrative) (Details) (USD $)	1 Months Ended	3 Months Ended	12 Months Ended
	Aug. 31, 2009	Jun. 30, 2006	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Stockholders' Equity [Abstract]
Preferred stock, shares authorized			1,000,000	1,000,000
Common stock, shares authorized			70,000,000	70,000,000
Common stock, par value			$ 0.01	$ 0.01
Common stock, shares issued			37,712,000	37,250,000
Common stock, shares outstanding			37,712,068	37,250,000
Aggregate amount of stock repurchases authorized			$ 86,300,000
Cash dividends declared per share		$ 0.03	$ 0.12	$ 0.12	$ 0.12
Cash dividends paid			$ 4,510,000	$ 4,454,000	$ 4,371,000
Number of common stock issued in connection with exercise of warrants	7,264
Warrants outstanding			3,567
Exercise price of warrants outstanding			$ 0.85
Warrant expiration year			2012