Stockholders Equity (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2012	Mar. 31, 2012	Jun. 30, 2011	Mar. 31, 2011	Jun. 30, 2012	Jun. 30, 2011
Stockholders Equity [Abstract]
Shares repurchased under the program (in shares)					325,970
Shares withheld for tax withholding obligations for the vesting of restricted stock awards (in shares)					107,041
Authorized to repurchased additional shares under repurchase program (in shares)	910,902				910,902
Dividends declared per share of common stock (in dollars per share)	$ 0.17	$ 0.15	$ 0.15	$ 0.15
Dividend paid					$ 8,285	$ 7,953