Stockholders Equity (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended							9 Months Ended
	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Sep. 30, 2012	Sep. 30, 2011
Stockholders Equity [Abstract]
Shares repurchased under the program (in shares)								407,400
Shares withheld for tax withholding obligations for the vesting of restricted stock awards (in shares)								107,228
Authorized to repurchased additional shares under repurchase program (in shares)	829,472							829,472
Dividends declared per share of common stock (in dollars per share)	$ 0.17	$ 0.17	$ 0.15	$ 0.15	$ 0.15	$ 0.15	$ 0.15
Dividend paid								$ 12,643	$ 11,900