Stockholders' Equity (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Stockholders Equity [Abstract]
Shares repurchased under the program (in shares)	356,653
Shares withheld for tax withholding obligations for the vesting of restricted stock awards (in shares)	115,558
Authorized to repurchased additional shares under repurchase program (in shares)	472,819
Dividends declared per share of common stock (in dollars per share)	$ 0.17	$ 0.15
Dividend paid	$ 4,349	$ 3,900